The 2018 Pacific hurricane season was an event in the annual cycle of tropical cyclone formation, in which tropical cyclones form in the eastern Pacific Ocean. The season officially started on May 15 in the eastern Pacific—east of 140°W—and began on June 1 in the central Pacific—the region between the International Date Line and 140°W, and ended on November 30. These dates typically cover the period of each year when most tropical cyclones form in the eastern Pacific basin. The season began with the formation of Tropical Depression One-E, which developed on May 10, and ended with the dissipation of the season's final storm, Tropical Storm Xavier, which dissipated as a tropical cyclone on November 5.

The 2018 hurricane season was exceptionally active and featured the highest Accumulated Cyclone Energy since reliable records began in 1971. Throughout the season, 26 tropical depressions developed, 23 of which became tropical storms. A total of 13 tropical storms reached hurricane strength, and 10 hurricanes achieved major hurricane intensity. The basin saw above-average activity across all regions from the International Date Line to the west coast of Mexico and Central America. Activity peaked from early August to early October, with several long-lived and powerful hurricanes developing in that time period. Several storms severely affected land, such as Hurricane Lane in Hawaii and Hurricane Willa in Mexico. In contrast to the similarly active 2015 Pacific hurricane season, 2018 was not significantly influenced by the El Niño–Southern Oscillation. Instead, low pressures and increased sea surface temperatures associated with the Pacific Meridional Mode supported the development of these intense and long-lived storms.

Four time zones are utilized in the basin: Central for storms east of 106°W, Mountain between 114.9°W and 106°W, Pacific between 140°W and 115°W, and Hawaii–Aleutian for storms between the International Date Line and 140°W. However, for convenience, all information is listed in Coordinated Universal Time (UTC) first with the respective local time included in parentheses. This timeline includes information that was not released while the storm was active, meaning that data from post-storm reviews by the National Hurricane Center is included. This timeline documents the formation of tropical cyclones as well as the strengthening, weakening, landfalls, extratropical transitions, and dissipations during the season.

Timeline of events

May

May 10
 12:00 UTC (5:00 a.m. PDT) at  – Tropical Depression One-E forms from an area of low pressure roughly  southwest of Cabo San Lázaro, Baja California Sur. At the time, this was the second-earliest formation of a tropical cyclone in the Eastern Pacific proper behind Tropical Storm Adrian a year prior.
 18:00 UTC (11:00 a.m. PDT) at  – Tropical Depression One-E reaches its peak intensity with maximum sustained winds of 35 mph (55 km/h) and a minimum pressure of , approximately  southwest of Cabo San Lázaro, Baja California Sur.

May 11
 18:00 UTC (11:00 a.m. PDT) at  – Tropical Depression One-E degenerates into a remnant low roughly  west-southwest of Cabo San Lázaro, Baja California Sur.

May 15
 The 2018 Eastern Pacific hurricane season officially begins.

June
June 1

 The 2018 Central Pacific hurricane season officially begins.

June 6
 00:00 UTC (7:00 p.m. CDT, June 5) at  – Tropical Depression Two-E develops from an area of low pressure roughly  south-southwest of Punta San Telmo, Michoacán.
 06:00 UTC (12:00 a.m. MDT) at  – Tropical Depression Two-E intensifies into Tropical Storm Aletta roughly  south-southwest of Punta San Telmo, Michoacán.

June 7
 18:00 UTC (12:00 p.m. MDT) at  – Tropical Storm Aletta intensifies into a Category 1 hurricane roughly  southwest of Punta Pérula, Jalisco.

June 8
 00:00 UTC (6:00 p.m. MDT, June 7) at  – Hurricane Aletta intensifies into a Category 2 hurricane roughly  southwest of Punta Pérula, Jalisco.
 06:00 UTC (12:00 a.m. MDT) at  – Hurricane Aletta rapidly intensifies into a Category 3 hurricane about roughly  southwest of Punta Pérula, Jalisco.
 12:00 UTC (6:00 a.m. MDT) at  – Hurricane Aletta quickly strengthens into a Category 4 hurricane roughly  southwest of Punta Pérula, Jalisco. Simultaneously, the storm reaches peak intensity with winds of 140 mph (220 km/h) and a minimum pressure of .

June 9
 00:00 UTC (6:00 p.m. MDT, June 8) at  – Hurricane Aletta degenerates into a Category 3 hurricane roughly  south-southwest of Cabo San Lucas, Baja California Sur.
 12:00 UTC (6:00 a.m. MDT) at  – Hurricane Aletta degenerates into a Category 2 hurricane roughly  south-southwest of Cabo San Lucas, Baja California Sur.
 18:00 UTC (12:00 p.m. MDT) at  – Hurricane Aletta degenerates into a Category 1 hurricane roughly  south-southwest of Cabo San Lucas, Baja California Sur.
 18:00 UTC (1:00 p.m. CDT) at  – Tropical Depression Three-E forms about 330 mi (530 km) south of Acapulco.

June 10
 00:00 UTC (6:00 p.m. MDT, June 9) at  – Hurricane Aletta degenerates into a tropical storm roughly  south-southwest of Cabo San Lucas, Baja California Sur.
 00:00 UTC (7:00 p.m. CDT, June 9) at  – Tropical Depression Three-E strengthens into Tropical Storm Bud about 305 mi (490 km) south of Acapulco.
 18:00 UTC (1:00 p.m. CDT) at  – Tropical Storm Bud intensifies into a Category 1 hurricane about 280 mi (450 km) south of Manzanillo, Colima.

June 11
 06:00 UTC (12:00 a.m. MDT) at  – Hurricane Bud intensifies into a Category 2 hurricane about 225 miles (360 km) south-southwest of Manzanillo, Colima.
 12:00 UTC (8:00 a.m. PDT) at  – Tropical Storm Aletta degenerates into a remnant low roughly  south-southwest of Cabo San Lázaro, Baja California Sur.
 12:00 UTC (6:00 a.m. MDT) at  – Hurricane Bud intensifies into a Category 3 hurricane about 280 miles (450 km) south-southwest of Cabo Corrientes, Mexico.

June 12
 00:00 UTC (6:00 p.m. MDT, June 11) at  – Hurricane Bud reaches peak intensity with winds of 140 mph (220 km/h) and a minimum pressure of 943 mbar (hPa; 27.85 inHg), while located about 240 miles (390 km) south-southwest of Cabo Corrientes, Mexico.
 12:00 UTC (6:00 a.m. MDT) at  – Hurricane Bud weakens into a Category 3 hurricane about 230 miles (365 km) southwest of Cabo Corrientes, Mexico.

June 13
 00:00 UTC (6:00 p.m. MDT June 12) at  – Hurricane Bud weakens into a Category 1 hurricane about 310 miles (500 km) south-southeast of Cabo San Lucas, Mexico.
 12:00 UTC (6:00 a.m. MDT) at  – Hurricane Bud weakens into a tropical storm about 265 miles (430 km) south-southeast of Cabo San Lucas, Mexico.

June 14
18:00 UTC (1:00 p.m. CDT) at  – Tropical Depression Four-E develops from an area of low pressure about 140 miles (220 km) south of Acapulco, Mexico.

June 15
 02:00 UTC (8:00 p.m. MDT, June 14) at  – Tropical Storm Bud makes landfall near San José del Cabo, about 15 miles (25 km) east-northeast of Cabo San Lucas, Mexico.
 12:00 UTC (6:00 a.m. MDT) at  – Tropical Storm Bud weakens into a post-tropical cyclone about 140 miles (220 km) south-southwest of Huatabampito, Mexico.
 18:00 UTC (1:00 p.m. CDT) at  – Tropical Depression Four-E intensifies into Tropical Storm Carlotta about 80 miles (125 km) south of Acapulco, Mexico.

June 17
 00:00 UTC (7:00 p.m. CDT, June 16) at  – Tropical Storm Carlotta reaches peak intensity with winds of 65 mph (100 km/h) and a minimum pressure of 997 mbar (hPa; 29.44 inHg), located around 45 miles (70 km) southeast of Acapulco, Mexico.
 18:00 UTC (1:00 p.m. CDT) at  – Tropical Storm Carlotta degenerates into a tropical depression about 45 miles (70 km) south of Zihuatanejo, Mexico.

June 19
 00:00 UTC (7:00 p.m. CDT, June 18) at  – Tropical Depression Carlotta degenerates into a remnant low roughly 85 miles (135 km) west of Lázaro Cárdenas, Mexico.

June 24
 00:00 UTC (5:00 p.m. CDT, June 22) at  – Tropical Depression Five-E develops from an area of low pressure about 730 miles (1,175 km) southwest of the southern tip of Baja California.
 12:00 UTC (5:00 a.m. PDT) at  – Tropical Depression Five-E intensifies into Tropical Storm Daniel approximately 635 miles (1,020 km) southwest of the southern tip of Baja California.
 18:00 UTC (11:00 a.m. PDT) at  – Tropical Storm Daniel reaches peak intensity with winds of 45 mph (75 km/h) and a minimum pressure of 1004 mbar (hPa; 29.65 inHg), approximately 585 miles (940 km) southwest of the southern tip of Baja California.

June 25
 18:00 UTC (11:00 a.m. PDT) at  – Tropical Storm Daniel degenerates to a tropical depression roughly 565 miles (905 km) west-southwest of the southern tip of Baja California.

June 26
 06:00 UTC (11:00 p.m. PDT, June 25) at  – Tropical Depression Daniel degenerates to a remnant low roughly 615 miles (990 km) west-southwest of the southern tip of Baja California.

June 27
 18:00 UTC (12:00 p.m. MDT) at  – Tropical Depression Six-E forms approximately 505 miles (810 km) southwest of Manzanillo, Colima.

June 28
 12:00 UTC (6:00 a.m. MDT) at  – Tropical Depression Six-E strengthens into Tropical Storm Emilia approximately 610 miles (985 km) south of the southern tip of Baja California.

June 29
 12:00 UTC (5:00 a.m. PDT) at  – Tropical Storm Emilia attains peak intensity with winds of 60 mph (95 km/h) and a minimum pressure of 997 mbar (hPa; 29.44 inHg), roughly 610 miles (980 km) from the southern tip of Baja California.

June 30
 12:00 UTC (5:00 a.m. PDT) at  – Tropical Storm Emilia weakens into a tropical depression roughly 685 miles (1,100 km) west-southwest of the southern tip of Baja California.
 18:00 UTC (1:00 p.m. CDT) at  – Tropical Depression Seven develops from an area of low pressure approximately 560 miles (900 km) south-southwest of Manzanillo, Colima.

July
July 1
 06:00 UTC (12:00 a.m. MDT) at  – Tropical Depression Seven intensifies into Tropical Storm Fabio about 525 miles (850 km) south-southwest of Manzanillo, Mexico.

July 2
 00:00 UTC (5:00 p.m. PDT, July 1) at  – Tropical Depression Emilia weakens into a remnant low roughly 965 miles (1,555 km) west of the southern tip of Baja California.
 12:00 UTC (6:00 a.m. MDT) at  – Tropical Storm Fabio intensifies into a Category 1 hurricane roughly 690 miles (1,110 km) south of the southern tip of the Baja California Peninsula.

July 3
 06:00 UTC (11:00 p.m. PDT, July 2) at  – Hurricane Fabio intensifies into a Category 2 hurricane approximately 610 miles (985 km) southwest of the southern tip of the Baja California Peninsula.
 18:00 UTC (11:00 a.m. PDT) at  – Hurricane Fabio attains its peak intensity with maximum sustained winds of 110 mph (175 km/h) and a minimum barometric pressure of 964 mbar (hPa; 28.47 inHg) about 640 miles (1,035 km) southwest of the southern tip of the Baja California Peninsula.

July 4
 18:00 UTC (11:00 a.m. PDT) at  – Hurricane Fabio degenerates to a Category 1 hurricane roughly 810 miles (1,300 km) west-southwest of the southern tip of the Baja California Peninsula.

July 5
 06:00 UTC (11:00 p.m. PDT, July 4) at  – Hurricane Fabio weakens to a tropical storm approximately 905 miles (1,455 km) west-southwest of the southern tip of the Baja California Peninsula.

July 6
 06:00 UTC (11:00 p.m. PDT, July 5) at  – Tropical Storm Fabio degenerates to a post-tropical cyclone about 1,190 miles (1,910 km) west of the southern tip of the Baja California Peninsula.

July 26
 12:00 UTC (5:00 a.m. PDT) at  – Tropical Depression Eight-E forms roughly 1,035 miles (1,665 km) southwest of the southern tip of Baja California.
 18:00 UTC (11:00 a.m. PDT) at  – Tropical Depression Eight-E intensifies into Tropical Storm Gilma approximately 1,085 miles (1,745 km) west-southwest of the southern tip of Baja California.
 18:00 UTC (11:00 a.m. PDT) at  – Tropical Depression Nine-E forms roughly 1,435 miles (2,315 km) east-southeast of Hilo, Hawaii.

July 27

 06:00 UTC (11:00 p.m. PDT, July 26) at  – Tropical Storm Gilma reaches peak intensity with winds of 45 mph (75 km/h) and a pressure of 1005 mbar (hPa; 29.68 inHg), while located approximately 1,210 miles (1,945 km) west-southwest of the southern tip of Baja California.
 18:00 UTC (11:00 a.m. PDT) at  – Tropical Storm Gilma degenerates into a tropical depression approximately 1,375 miles (2,215 km) west-southwest of the southern tip of Baja California.

July 28
 00:00 UTC (5:00 p.m. PDT, July 27) – Tropical Depression Nine-E dissipates roughly 1,210 miles (1,945 km) southeast of Hilo, Hawaii.

July 29
 12:00 UTC (5:00 a.m. PDT) at  – Tropical Depression Gilma degenerates to a remnant low roughly 1,150 miles (1,850 km) east of Hilo, Hawaii.

July 31
 12:00 UTC (5:00 a.m. PDT) at  – Tropical Depression Ten-E develops from an area of low pressure about 805 miles (1,295 km) southwest of the southern tip of Baja California.

August
August 1
 00:00 UTC (5:00 p.m. PDT, July 31) at  – Tropical Depression Ten-E intensifies into Tropical Storm Hector approximately 845 miles (1,360 km) southwest of the southern tip of Baja California.

August 2
 12:00 UTC (5:00 a.m. PDT) at  – Tropical Storm Hector intensifies into a Category 1 hurricane approximately 1,090 miles (1,750 km) west-southwest of the southern tip of Baja California.
 18:00 UTC (11:00 a.m. PDT) at  – Hurricane Hector intensifies into a Category 2 hurricane while located roughly 1,155 miles (1,860 km) west-southwest of the southern tip of Baja California.

August 3
 12:00 UTC (5:00 a.m. PDT) at  – Hurricane Hector degenerates to a Category 1 hurricane while located roughly 1,340 miles (2,160 km) west-southwest of the southern tip of Baja California.
 18:00 UTC (11:00 a.m. PDT) at  – Hurricane Hector re-intensifies into a Category 2 hurricane while located roughly 1,400 miles (2,255 km) west-southwest of the southern tip of Baja California.

August 4
 00:00 UTC (5:00 p.m. PDT, August 3) at  – Hurricane Hector intensifies into a Category 3 hurricane approximately 1,455 miles (2,345 km) west-southwest of the southern tip of Baja California.
 18:00 UTC (1:00 p.m. CDT) at  – Tropical Depression Eleven-E forms from an area of low pressure approximately 270 miles (435 km) south-southeast of Puerto Angel, Oaxaca.

August 5
 12:00 UTC (5:00 a.m. CDT) at  – Tropical Depression Eleven-E intensifies into Tropical Storm Ileana approximately 170 miles (275 km) south-southeast of Puerto Angel, Oaxaca.
 12:00 UTC (7:00 a.m. CDT) at  – Tropical Depression Twelve-E forms while located roughly  south-southwest of Punta San Telmo, Michoacán.
 18:00 UTC (11:00 a.m. PDT) at  – Hurricane Hector intensifies into a Category 4 hurricane approximately 1,250 miles (2,015 km) east-southeast of South Point, Hawaii.

August 6
 00:00 UTC (6:00 p.m. MDT, August 5) at  – Tropical Depression Twelve-E intensifies into Tropical Storm John while located roughly  southwest of Punta San Telmo, Michoacán.
 06:00 UTC (08:00 p.m. HST August 5) at  – Hurricane Hector enters the Central Pacific Hurricane Center's (CPHC) area of responsibility.
 12:00 UTC (5:00 a.m. CDT) at  – Tropical Storm Ileana peaks with winds of 65 mph (100 km/h) and a minimum pressure of  approximately 170 miles (490 km) southeast of Manzanillo, Mexico.
 18:00 UTC (08:00 a.m. PDT) at  – Hurricane Hector reaches peak intensity with winds of 155 mph (250 km/h) and a minimum pressure of  approximately 890 miles (1,430 km) east-southeast of Hilo, Hawaii.
 18:00 UTC (11:00 a.m. PDT) at  – Tropical Storm John intensifies into a Category 1 hurricane while located roughly  southwest of Punta Pérula, Jalisco.
 18:00 UTC (11:00 p.m. PDT) at  – Tropical Depression Thirteen-E forms while located roughly  southwest of Cabo San Lázaro, Baja California Sur.

August 7
 00:00 UTC (5:00 p.m. PDT, August 6) at  – Tropical Depression Thirteen-E intensifies into Tropical Storm Kristy while located roughly  southwest of Cabo San Lázaro, Baja California Sur.
 12:00 UTC (5:00 a.m. CDT) – Tropical Storm Ileana is absorbed by Hurricane John.
 12:00 UTC (6:00 a.m. MDT) at  – Hurricane John intensifies into a Category 2 hurricane while located roughly  southwest of Cabo Corrientes, Jalisco.
 18:00 UTC (12:00 p.m. MDT) at  – Hurricane John reaches peak intensity with maximum sustained winds of 110 mph (175 km/h) and a minimum pressure of  while located roughly  south of Cabo San Lucas, Baja California Sur.

August 8
 06:00 UTC (12:00 a.m. MDT) at  – Hurricane John degenerates into a Category 1 hurricane while located roughly  south-southwest of Cabo San Lucas, Baja California Sur.
 12:00 UTC (02:00 a.m. HST) at  – Hurricane Hector weakens into a Category 3 hurricane approximately 260 miles (420 km) south-southeast of Hilo, Hawaii.

August 9
 12:00 UTC (5:00 a.m. PDT) at  – Hurricane John degenerates into a tropical storm while located roughly  southwest of Punta Abreojos, Baja California Sur.

August 10
 06:00 UTC (11:00 p.m. PDT, August 9) at  – Tropical Storm Kristy reaches peak intensity with maximum sustained winds of 70 mph (110 km/h) and a minimum pressure of  while located roughly  west-southwest of Punta Eugenia, Baja California Sur.
 06:00 UTC (08:00 p.m. HST, August 9) at  – Hurricane Hector re-strengthens into a Category 4 hurricane approximately 385 miles (620 km) east of Johnston Island.
 18:00 UTC (11:00 p.m. PDT) at  – Tropical Storm John degenerates into a remnant low while located roughly  west-southwest of Punta Eugenia, Baja California Sur.

August 11
 06:00 UTC (08:00 p.m. HST, August 10) at  – Hurricane Hector weakens into a Category 3 hurricane approximately 130 miles (215 km) north-northeast of Johnston Island.
 12:00 UTC (5:00 a.m. PDT) at  – Tropical Storm Kristy weakens into a tropical depression while located roughly  southwest of Point Conception, California.
 18:00 UTC (08:00 a.m. HST) at  – Hurricane Hector degenerates into a Category 2 hurricane approximately 210 miles (335 km) north-northwest of Johnston Island.

August 12
 12:00 UTC (02:00 a.m. HST) at  – Hurricane Hector weakens into a Category 1 hurricane approximately 320 miles (520 km) southeast of Midway Island.
 12:00 UTC (5:00 a.m. PDT) at  – Tropical Depression Kristy degenerates into a remnant low while located roughly  southwest of Point Conception, California.

August 13
 00:00 UTC (02:00 p.m. HST, August 12) at  – Hurricane Hector degenerates into a tropical storm approximately 285 miles (455 km) south-southeast of Midway Island.
 18:00 UTC (08:00 a.m. HST) at  – Tropical Storm Hector crosses the International Dateline and enters the Japan Meteorological Agency's area of responsibility.

August 15
00:00 UTC (5:00 p.m. PDT, August 14) at  – Tropical Depression Fourteen-E forms  southwest of the southern tip of the Baja California peninsula.
12:00 UTC (5:00 a.m. PDT) at  – Tropical Depression Fourteen-E strengthens into Tropical Storm Lane  southwest of the southern tip of the Baja California peninsula.

August 17
00:00 UTC (5:00 p.m. PDT, August 16) at  – Tropical Storm Lane strengthens into a Category 1 hurricane  west-southwest of the southern tip of the Baja California peninsula.
12:00 UTC (5:00 a.m. PDT) at  – Hurricane Lane strengthens into a Category 2 hurricane  west-southwest of the southern tip of the Baja California peninsula.

August 18
00:00 UTC (5:00 p.m. PDT, August 17) at  – Hurricane Lane strengthens into a Category 3 hurricane  west-southwest of the southern tip of the Baja California peninsula.
06:00 UTC (11:00 p.m. PDT, August 17) at  – Hurricane Lane strengthens into a Category 4 hurricane  west-southwest of the southern tip of the Baja California peninsula.

August 19

00:00 UTC (2:00 p.m. HST, August 18) at  – Hurricane Lane enters the CPHC's area of responsibility.
06:00 UTC (8:00 p.m. HST, August 18) at  – Hurricane Lane degenerates into a Category 3 hurricane  east-southeast of Hilo, Hawaii.

August 21
00:00 UTC (2:00 p.m. HST, August 20) at  – Hurricane Lane restrengthens into a Category 4 hurricane  southeast of Hilo, Hawaii.

August 22
00:00 UTC (2:00 p.m. HST, August 21) at  – Hurricane Lane restrengthens into a Category 5 hurricane  south-southeast of Hilo, Hawaii.
06:00 UTC (8:00 p.m. HST, August 21) at  – Hurricane Lane peaks with winds of 160 mph (260 km/h) and a minimum pressure of , about  south of Hilo, Hawaii.
12:00 UTC (2:00 a.m. HST) at  – Hurricane Lane degenerates to a Category 4 hurricane  south of Hilo, Hawaii.

August 24
00:00 UTC (2:00 p.m. HST, August 23) at  – Hurricane Lane weakens to a Category 3 hurricane  southwest of Hilo, Hawaii.
12:00 UTC (2:00 a.m. HST) at  – Hurricane Lane degenerates to a Category 2 hurricane  west-southwest of Hilo, Hawaii.
18:00 UTC (8:00 a.m. HST) at  – Hurricane Lane weakens to a Category 1 hurricane  west-southwest of Hilo, Hawaii.

August 25
06:00 UTC (8:00 p.m. HST, August 24) at  – Hurricane Lane degenerates to a tropical storm  west of Hilo, Hawaii.

August 26
06:00 UTC (11:00 p.m. PDT, August 25) at  – Tropical Depression Fifteen-E forms from an area of low pressure approximately  west-southwest of the southern tip of Baja California.
12:00 UTC (2:00 a.m. HST) at  – Tropical Storm Lane weakens to a tropical depression  west of Hilo, Hawaii.
12:00 UTC (5:00 a.m. PDT) at  – Tropical Depression Fifteen-E strengthens into Tropical Storm Miriam approximately  west-southwest of the southern tip of Baja California.

August 27
12:00 UTC (2:00 a.m. HST) at  – Tropical Depression Lane restrengthens to a tropical storm  east-northeast of Johnston Island.

August 28

00:00 UTC (2:00 p.m. HST, August 27) at  – Tropical Storm Lane degenerates to a tropical depression  northeast of Johnston Island.
12:00 UTC (5:00 a.m. PDT) at  – Tropical Depression Sixteen-E forms from an area of low pressure approximately  west-southwest of Manzanillo, Mexico.
18:00 UTC (11:00 a.m. PDT) at  – Tropical Depression Sixteen-E strengthens into Tropical Storm Norman approximately  west-southwest of Manzanillo, Mexico.

August 29
00:00 UTC (2:00 p.m. HST, August 28) at  – Tropical Depression Lane weakens to a remnant low  north-northeast of Johnston Island.
18:00 UTC (11:00 a.m. PDT) at  – Tropical Storm Miriam strengthens into a Category 1 hurricane approximately  west-southwest of the southern tip of Baja California.
18:00 UTC (11:00 a.m. PDT) at  – Tropical Storm Norman strengthens into a Category 1 hurricane approximately  west-southwest of Manzanillo, Mexico.

August 30
00:00 UTC (2:00 p.m. HST, August 29) at  – Hurricane Miriam enters the CPHC's area of responsibility.
06:00 UTC (11:00 p.m. PDT, August 29) at  – Hurricane Norman strengthens into a Category 2 hurricane approximately  west-southwest of Manzanillo, Mexico.
12:00 UTC (5:00 a.m. PDT) at  – Hurricane Norman strengthens into a Category 4 hurricane approximately  west-southwest of Manzanillo, Mexico.
18:00 UTC (11:00 a.m. PDT) at  – Hurricane Norman peaks with winds of 150 mph (240 km/h) and a minimum pressure of , approximately  southwest of the southern tip of Baja California.

August 31
18:00 UTC (8:00 a.m. HST) at  – Hurricane Miriam peaks as a Category 2 hurricane with winds of 100 mph (155 km/h) and a minimum pressure of  approximately  east of Hilo, Hawaii.
18:00 UTC (11:00 a.m. PDT) at  – Hurricane Norman degenerates to a Category 3 hurricane approximately  southwest of the southern tip of Baja California.

September
September 1

00:00 UTC (5:00 p.m. PDT, August 31) at  – Tropical Depression Seventeen-E forms about 365 mi (590 km) southeast of Socorro Island.
06:00 UTC (8:00 p.m. HST, August 31) at  – Hurricane Miriam weakens to a Category 1 hurricane approximately  east of Hilo, Hawaii.
06:00 UTC (11:00 p.m. PDT, August 31) at  – Hurricane Norman degenerates to a Category 2 hurricane approximately  southwest of the southern tip of Baja California.
17:30 UTC (7:30 a.m. HST) at  – An upper-level low, designated Invest 96C, that absorbed the remnants of Hurricane Lane transitions into a tropical or subtropical cyclone approximately  south of Adak, Alaska. While the system was assessed as subtropical by the Central Pacific Hurricane Center, the National Oceanic and Atmospheric Administration's Satellite Products and Service Division analyzed it as a tropical storm through the Dvorak technique.
18:00 UTC (8:00 a.m. HST) at  – Hurricane Miriam weakens to a tropical storm approximately  east-northeast of Hilo, Hawaii.
23:30 UTC (1:30 p.m. HST) at  – Scatterometer data reveals Invest 96C to have attained peak winds of 45 mph (75 km/h) about  south of Adak, Alaska.

September 2
00:00 UTC (5:00 p.m. PDT, September 1) at  – Tropical Depression Seventeen-E strengthens into Tropical Storm Olivia about 230 mi (370 km) south of Socorro Island.
12:00 UTC (2:00 a.m. HST) at  – Tropical Storm Miriam degenerates to a tropical depression approximately  northeast of Hilo, Hawaii.
12:00 UTC (5:00 a.m. PDT) at  – Hurricane Norman strengthens to a Category 4 hurricane approximately  west-southwest of the southern tip of Baja California.
17:30 UTC (7:30 a.m. HST) at  – Dvorak assessments of Invest 96C indicate it to have weakened to a tropical depression about  south of Adak, Alaska.
18:00 UTC (8:00 a.m. HST) at  – Tropical Depression Miriam weakens to a remnant low approximately  northeast of Hilo, Hawaii.

September 3
5:30 UTC (7:30 p.m. HST, September 2) at  – The Satellite Products and Service Division issues its final bulletin on Invest 96C as Dvorak assessments indicate the system to be too weak to classify as a tropical cyclone about  south of Adak, Alaska.
06:00 UTC (11:00 p.m. PDT, September 2) at  – Hurricane Norman degenerates to a Category 3 hurricane approximately  west-southwest of the southern tip of Baja California.
18:00 UTC (11:00 a.m. PDT) at  – Hurricane Norman weakens to a Category 2 hurricane approximately  west-southwest of the southern tip of Baja California.

September 4
00:00 UTC (5:00 p.m. PDT, September 3) at  – Hurricane Norman degenerates to a Category 1 hurricane approximately  west-southwest of the southern tip of Baja California.
00:00 UTC (2:00 p.m. HST, September 3) at  – Hurricane Norman crosses into the Central Pacific Hurricane Center's area of responsibility.
00:00 UTC (5:00 p.m. PDT, September 3) at  – Tropical Storm Olivia intensifies into a Category 1 hurricane approximately 120 mi (195 km) southwest of Clarion Island.
12:00 UTC (5:00 a.m. PDT) at  – Hurricane Olivia rapidly intensifies into a Category 2 hurricane about 215 mi (345 km) west-southwest of Clarion Island.
18:00 UTC (11:00 a.m. PDT) at  – Hurricane Olivia rapidly intensifies into a Category 3 hurricane about 275 mi (440 km) west-southwest of Clarion Island.

September 5

00:00 UTC (5:00 p.m. PDT, September 4) at  – Hurricane Olivia reaches its initial peak intensity with winds of 125 mph (205 km/h) and a pressure of 954 mbar (hPa; 28.17 inHg) approximately 335 mi (540 km) west-southwest of Clarion Island.
12:00 UTC (2:00 a.m. HST) at  – Hurricane Norman strengthens to a Category 3 hurricane approximately  east of Hilo, Hawaii.
12:00 UTC (5:00 a.m. PDT) at  – Increasing wind shear causes Hurricane Olivia to weaken to a Category 2 hurricane approximately 470 mi (760 km) west-southwest of Clarion Island.

September 6
12:00 UTC (5:00 a.m. PDT) at  – Hurricane Olivia unexpectedly re-intensifies into a Category 3 hurricane approximately 780 mi (1,255 km) west of Clarion Island.
18:00 UTC (8:00 a.m. HST) at  – Hurricane Norman weakens to a Category 2 hurricane approximately  east-northeast of Hilo, Hawaii.

September 7
00:00 UTC (5:00 p.m. PDT, September 6) at  – Hurricane Olivia further intensifies into a Category 4 hurricane and reaches its peak intensity with winds of 130 mph (215 km/h) and a minimum pressure of 951 mbar (hPa; 28.08 inHg) about 950 mi (1,525 km) west of Clarion Island.
06:00 UTC (8:00 p.m. HST, September 6) at  – Hurricane Norman degenerates to a Category 1 hurricane approximately  northeast of Hilo, Hawaii.
06:00 UTC (11:00 p.m. PDT, September 6) at  – Hurricane Olivia weakens to a Category 3 hurricane about 1,035 mi (1,665 km) west-northwest of Clarion Island.
12:00 UTC (5:00 a.m. PDT) at  – Hurricane Olivia further degenerates to a Category 2 hurricane approximately 1,120 mi (1,800 km) west-northwest of Clarion Island.
18:00 UTC (8:00 a.m. HST) at  – Hurricane Norman weakens to a tropical storm approximately  northeast of Hilo, Hawaii.

September 8
06:00 UTC (11:00 p.m. PDT, September 7) at  – Hurricane Olivia degenerates to a Category 1 hurricane about 1,250 mi (2,010 km) east-northeast of Hilo, Hawaii.
06:00 UTC (12:00 a.m. MDT) at  – Tropical Depression Eighteen-E develops from an area of low pressure about  south-southwest of the southern tip of Baja California Sur.

September 9
00:00 UTC (2:00 p.m. HST, September 8) at  – Tropical Storm Norman transitions to an extratropical cyclone approximately  north of Hilo, Hawaii.
00:00 UTC (2:00 p.m. HST, September 8) at  – Hurricane Olivia enters the Central Pacific Hurricane Center's area of responsibility.
00:00 UTC (5:00 p.m. PDT, September 8) at  – Tropical Depression Eighteen-E strengthens into Tropical Storm Paul roughly  southwest of Clairon Island.
18:00 UTC (11:00 a.m. PDT) at  – Tropical Storm Paul achieves its peak intensity with winds of 45 mph (75 km/h) and a pressure of  about  west of Clairon Island.

September 10
12:00 UTC (2:00 a.m. HST) – Norman dissipates over  north-northeast of Hilo, Hawaii.

September 11
06:00 UTC (8:00 p.m. HST, September 10) at  – Hurricane Olivia weakens to a tropical storm approximately 375 mi (605 km) northeast of Hilo, Hawaii.
06:00 UTC (11:00 a.m. PDT, September 10) at  – Tropical Storm Paul degenerates to a tropical depression about  northwest of Clairon Island.

September 12

00:00 UTC (5:00 p.m. PDT, September 11) at  – Tropical Depression Paul degenerates into a remnant low approximately  west-northwest of Clairon Island.
19:10 UTC (9:10 a.m. HST) at  – Tropical Storm Olivia makes landfall on the Hawaiian island of Maui, just northwest of Kahului, with winds of 45 mph (75 km/h). This marks the first known instance of a tropical cyclone making landfall on the island.
19:54 UTC (9:54 a.m. HST) at  – After crossing the ʻAuʻau Channel, Tropical Storm Olivia makes a second landfall just northwest of Lanai City, Lanai with winds of 45 mph (75 km/h). This is also marks the first time a tropical cyclone made landfall on the island.

September 13
06:00 UTC (8:00 p.m. HST, September 12) at  – Tropical Storm Olivia weakens to a tropical depression about 150 mi (240 km) southwest of Honolulu, Hawaii.
18:00 UTC (8:00 a.m. HST) at  – Tropical Depression Olivia briefly reorganizes into a tropical storm about 340 mi (550 km) southwest of Honolulu, Hawaii.

September 14
06:00 UTC (8:00 p.m. HST, September 13) at  – Tropical Storm Olivia degenerates into a remnant low about 485 mi (785 km) southwest of Honolulu, Hawaii.

September 19

12:00 UTC (6:00 a.m. MDT) at  – Tropical Depression Nineteen-E develops from an elongated trough just east of Loreto, Baja California Sur over the Gulf of California. This marks the first known instance of a tropical cyclone forming within the Gulf of California since the National Hurricane Center's records began in 1949.

September 20
00:00 UTC (8:00 p.m. MDT, September 19) at  – Tropical Depression Nineteen-E reaches its peak intensity with winds of 35 mph (55 km/h) and a minimum pressure of  about  west-southwest of Ciudad Obregón. The National Hurricane Center noted in its final report that the system may have briefly become a tropical storm before landfall but data were inconclusive.
03:00 UTC (11:00 p.m. MDT, September 19) at  – Tropical Depression Nineteen-E makes landfall at peak strength between Ciudad Obregón and Guaymas.
06:00 UTC (2:00 a.m. MDT) – Tropical Depression Nineteen-E rapidly dissipates over mountainous terrain about  east of Guaymas.

September 25
 06:00 UTC (12:00 a.m. MDT) at  – Tropical Depression Twenty-E forms from a tropical wave while located roughly  south-southwest of Manzanillo, Mexico.
 12:00 UTC (6:00 a.m. MDT) at  – Tropical Depression Twenty-E strengthens into Tropical Storm Rosa while  south-southwest of Manzanillo, Mexico.

September 26
 12:00 UTC (6:00 a.m. MDT) at  – Tropical Storm Rosa strengthens into a Category 1 hurricane while  southwest of Manzanillo, Mexico.

September 27
 12:00 UTC (6:00 a.m. MDT) at  – Hurricane Rosa strengthens into a Category 2 hurricane while  southwest of Manzanillo, Mexico.
 18:00 UTC (11:00 a.m. PDT) at  – Hurricane Rosa strengthens into a Category 3 hurricane while  south of Punta San Antonio, Mexico.

September 28

 00:00 UTC (5:00 p.m. PDT, September 27) at  – Hurricane Rosa strengthens into a Category 4 hurricane while  south of Punta San Antonio, Mexico.
 06:00 UTC (11:00 p.m. PDT, September 27) at  – Hurricane Rosa peaks with winds of 150 mph (240 km/h) and a minimum pressure of , while  south-southwest of Punta San Antonio, Mexico.
 18:00 UTC (11:00 a.m. PDT) at  – Hurricane Rosa weakens to a Category 3 hurricane while  south-southwest of Punta San Antonio, Mexico.

September 29
 00:00 UTC (5:00 p.m. PDT, September 28) at  – Hurricane Rosa degenerates into a Category 2 hurricane while  south-southwest of Punta San Antonio, Mexico.
 12:00 UTC (7:00 a.m. CDT) at  – Tropical Storm Sergio forms about  south of Zihuatanejo, Mexico.
12:00 UTC (2:00 a.m. HST) at  – A tropical depression develops approximately 505 mi (815 km) south-southwest of Ka Lae, Hawaii.
18:00 UTC (8:00 a.m. HST) at  – The tropical depression intensifies into Tropical Storm Walaka about 540 mi (870 km) south-southwest of Ka Lae, Hawaii.

September 30
 06:00 UTC (11:00 p.m. PDT, September 29) at  – Hurricane Rosa weakens into a Category 1 hurricane while  southwest of Punta San Antonio, Mexico.
18:00 UTC (8:00 a.m. HST) at  – Tropical Storm Walaka strengthens into a Category 1 hurricane about 800 mi (1,285 km) south-southwest of Honolulu, Hawaii.

October
October 1
00:00 UTC (5:00 p.m. PDT, September 30) at  – Hurricane Rosa weakens into a tropical storm while  southwest of Punta San Antonio, Mexico.
06:00 UTC (8:00 p.m. HST, September 30) at  – Hurricane Walaka rapidly intensifies into a Category 2 hurricane about 895 mi (1,440 km) southwest of Honolulu, Hawaii.
12:00 UTC (2:00 a.m. HST) at  – Hurricane Walaka rapidly intensifies into a Category 3 hurricane about 925 mi (1,490 km) southwest of Honolulu, Hawaii.
18:00 UTC (8:00 a.m. HST) at  – Hurricane Walaka rapidly intensifies into a Category 4 hurricane about 885 mi (1,425 km) southwest of Kauai, Hawaii.

October 2

00:00 UTC (5:00 p.m. PDT, October 1) at  – Tropical Storm Rosa weakens into a tropical depression while  south of Punta San Antonio, Mexico.
00:00 UTC (6:00 p.m. MDT, October 1) at  – Tropical Storm Sergio strengthens into a Category 1 hurricane about  west-southwest of Zihuatanejo, Mexico.
00:00 UTC (2:00 p.m. HST, October 1) at  – Hurricane Walaka's rapid intensification culminates with it becoming a Category 5 hurricane about 905 mi (1,455 km) southwest of Kauai, Hawaii. Concurrently, it reaches its peak intensity with maximum winds of 160 mph (260 km/h) and a minimum pressure of 921 mbar (hPa; 27.20 inHg).
11:00 UTC (5:00 a.m. MDT) at  – Tropical Depression Rosa makes landfall  southeast of Punta San Antonio, Mexico.
12:00 UTC (6:00 a.m. MDT) at  – Hurricane Sergio strengthens into a Category 2 hurricane about  west-southwest of Zihuatanejo, Mexico.
12:00 UTC (2:00 a.m. HST) at  – Hurricane Walaka weakens to a Category 4 hurricane about  southwest of Kauai, Hawaii.
18:00 UTC (12:00 p.m. MDT) – Tropical Depression Rosa dissipates over the Baja California peninsula.
18:00 UTC (12:00 p.m. MDT) at  – Hurricane Sergio strengthens into a Category 3 hurricane about  west-southwest of Zihuatanejo, Mexico.

October 4
00:00 UTC (5:00 p.m. PDT, October 3) at  – Hurricane Sergio strengthens into a Category 4 hurricane about  west-southwest of Zihuatanejo, Mexico.
06:00 UTC (11:00 p.m. PDT, October 3) at  – Hurricane Sergio peaks with winds of 140 mph (220 km/h) and a minimum pressure of , about  southwest of Cabo San Lucas, Mexico.
06:00 UTC (8:00 p.m. HST, October 3) at  – Hurricane Walaka weakens to a Category 3 hurricane about  west-northwest of Kauai, Hawaii.
06:20 UTC (8:20 p.m. HST, October 3) at  – Hurricane Walaka passes roughly  west-northwest of the French Frigate Shoals as a high-end Category 3 hurricane.
18:00 UTC (8:00 a.m. HST) at  – Hurricane Walaka degenerates to a Category 2 hurricane about  northwest of Kauai, Hawaii.

October 5
00:00 UTC (5:00 p.m. PDT, October 4) at  – Hurricane Sergio weakens to a Category 3 hurricane about  southwest of Cabo San Lucas, Mexico.
00:00 UTC (2:00 p.m. HST, October 4) at  – Hurricane Walaka degenerates to a Category 1 hurricane about  northwest of Kauai, Hawaii.
06:00 UTC (8:00 p.m. HST, October 4) at  – Hurricane Walaka weakens to a tropical storm about  northwest of Kauai, Hawaii.

October 6
12:00 UTC (2:00 a.m. HST) at  – Tropical Storm Walaka transitions to an extratropical cyclone about  north-northwest of Kauai, Hawaii.

October 7
12:00 UTC (5:00 a.m. PDT) at  – Hurricane Sergio degenerates to a Category 2 hurricane about  southwest of Cabo San Lucas, Mexico.
18:00 UTC (8:00 a.m. HST) – Walaka dissipates over  north-northeast of Kauai, Hawaii.

October 8
00:00 UTC (5:00 p.m. PDT, October 7) at  – Hurricane Sergio weakens to a Category 1 hurricane about  west-southwest of Cabo San Lucas, Mexico.

October 9

18:00 UTC (11:00 a.m. PDT) at  – Hurricane Sergio degenerates to a tropical storm about  west-southwest of Cabo San Lucas, Mexico.

October 12
12:00 UTC (6:00 a.m. MDT) at  – Tropical Storm Sergio makes landfall near Los Castros, Baja California Sur.
18:00 UTC (12:00 p.m. MDT) at  – Tropical Storm Sergio weakens to a tropical depression about  west-northwest of Guaymas, Mexico.
18:00 UTC (12:00 p.m. MDT) at  – Tropical Depression Sergio makes landfall about  west-northwest of Guaymas, Mexico.

October 13
00:00 UTC (6:00 p.m. MDT, October 12) – Tropical Depression Sergio dissipates inland over Mexico.

October 14
 12:00 UTC (7:00 a.m. CDT) at  – Tropical Depression Twenty-Two-E forms while located roughly  south-southwest of Lázaro Cárdenas, Michoacán.

October 15
 06:00 UTC (1:00 a.m. CDT) at  – Tropical Depression Twenty-Two-E intensifies into Tropical Storm Tara while located roughly  southwest of Punta San Telmo, Michoacán.

October 16
 00:00 UTC (7:00 p.m. CDT, October 15) at  – Tropical Storm Tara reaches peak intensity with maximum sustained winds of 65 mph (100 km/h) and a minimum pressure of  while located roughly  south of Manzanillo, Colima.
 18:00 UTC (1:00 p.m. CDT) – Tropical Storm Tara dissipates roughly  west-southwest of Manzanillo, Colima.

October 19
 06:00 UTC (1:00 a.m. CDT) at  – Tropical Depression Twenty-Three-E forms while located roughly  west-southwest of Puerto San José, Guatemala.
 18:00 UTC (1:00 p.m. CDT) at  – Tropical Depression Twenty-Three-E intensifies into Tropical Storm Vicente while around  west-southwest of Puerto San José, Guatemala.

October 20

00:00 UTC (7:00 p.m. CDT, October 19) at  – Tropical Depression Twenty-Four-E develops from a broad area of low pressure about roughly  south of Manzanillo, Colima.
12:00 UTC (7:00 a.m. CDT) at  – Tropical Depression Twenty-Four-E intensifies into Tropical Storm Willa about  south of Manzanillo, Colima.
 18:00 UTC (1:00 p.m. CDT) at  – Tropical Storm Vicente peaks with winds of 50 mph (85 km/h) and a pressure of , while around  southeast of Puerto Escondido, Mexico.

October 21
06:00 UTC (12:00 a.m. MDT) at  – Tropical Storm Willa rapidly intensifies into a Category 1 hurricane roughly  south-southwest of Manzanillo, Colima.
12:00 UTC (6:00 a.m. MDT) at  – Hurricane Willa rapidly intensifies into a Category 2 hurricane roughly  southwest of Manzanillo, Colima.
18:00 UTC (12:00 p.m. MDT) at  – Hurricane Willa rapidly intensifies into a Category 3 hurricane roughly  southwest of Manzanillo, Colima.

October 22
00:00 UTC (6:00 p.m. MDT, October 21) at  – Hurricane Willa rapidly intensifies into a Category 4 hurricane roughly  southwest of Manzanillo, Colima.
06:00 UTC (12:00 a.m. MDT) at  – Hurricane Willa's rapid intensification culminates with it becoming a Category 5 hurricane roughly  west-southwest of Manzanillo, Colima. It reaches its peak intensity at this time with winds of 160 mph (260 km/h) and a minimum pressure of . This marks the third time a Pacific hurricane season featured three Category 5 hurricanes since reliable records began, tying the record set in 1994 and 2002.
12:00 UTC (6:00 a.m. MDT) at  – Hurricane Willa weakens to a Category 4 hurricane approximately  southwest of Puerto Vallarta, Jalisco.

October 23
06:00 UTC (12:00 a.m. MDT) at  – Hurricane Willa weakens to a Category 3 hurricane roughly  west of Puerto Vallarta, Jalisco.
06:00 UTC (1:00 a.m. CDT) at  – Tropical Storm Vicente weakens to a tropical depression around  southwest of Playa Azul, Mexico.
13:30 UTC (7:30 a.m. CDT) at  – Tropical Depression Vicente makes landfall near Playa Azul, Mexico.
17:45 UTC (11:45 a.m. MDT) – Hurricane Willa passes over the Islas Marías archipelago with maximum winds of 115 mph (185 km/h); its eyewall traverses the islands of San Juanito and María Madre.
18:00 UTC (1:00 p.m. CDT) – Tropical Depression Vicente dissipates inland over Mexico.

October 24
01:20 UTC (8:20 p.m. CDT, October 23) at  – Hurricane Willa makes landfall with winds of 115 mph (185 km/h) and a pressure of  near Palmito del Verde, Sinaloa.
06:00 UTC (1:00 a.m. CDT) at  – Hurricane Willa rapidly degenerates into a tropical storm, due to a combination of mountainous terrain and strong wind shear while located about  southeast of Durango City, Durango.
12:00 UTC (7:00 a.m. CDT) – Tropical Storm Willa dissipates over northeastern Mexico.

November

November 2
 12:00 UTC (6:00 a.m. MDT) at  – Tropical Depression Twenty-Five-E forms from an area of low pressure about  southwest of Manzanillo, Colima.

November 3
 00:00 UTC (6:00 p.m. MDT, November 2) at  – Tropical Depression Twenty-Five-E strengthens into Tropical Storm Xavier about  southwest of Manzanillo, Colima.

November 4
 12:00 UTC (6:00 a.m. CST) at  – Tropical Storm Xavier reaches peak intensity with winds of 65 mph (100 km/h) and a minimum pressure of , about  southwest of Manzanillo, Colima.

November 6
 00:00 UTC (5:00 p.m. MST, November 5) at  – Tropical Storm Xavier degenerates into a remnant low about  east of Socorro Island.

November 30
 The 2018 Pacific hurricane season officially ends.

Notes

See also

 List of Pacific hurricanes
 Pacific hurricane season
 Timeline of the 2018 Atlantic hurricane season

References

External links

The National Hurricane Center's advisory archive for 2018

2018 Pacific hurricane season
Pacific hurricane meteorological timelines
Articles which contain graphical timelines