Cancún's weather is more humid this time of year and temperatures can climb to the low 90s. But on the bright side, hotel prices do dip significantly (some rooms are less than $50 a night).
http://travel.usnews.com/Cancun_Mexico/When_To_Visit/
The wet (rainy) season is May to October and it is slightly hotter. Cancun's dry season is November to April. It is much cooler also. The best time of year to travel to Cancun (weather-wise) is during the dry season's coolest months: January and February. March and April are the driest months of the year, and also the sunniest months in Cancun. Humidity is high in Cancun, often around 80%. April and May have the lowest humidity. Check out the Average Temperatures in Cancun for more details listed for each month including average high temps, low temps, wind and humidity.
http://www.cancunmx.com/weather/
Best Times to Visit Cancun. Share: Facebook Tweet Google+. The best time to visit Cancún is from December to April during the peak season. Even though the crowds are heavier, you'll experience near-perfect weather and find some of the cheapest flight and room rates for a winter getaway at the beach. Just try to avoid traveling from mid-March to early April — that's when spring breakers descend on the Yucatán's shores.
http://travel.usnews.com/Cancun_Mexico/When_To_Visit/
(Editor's Note: The Monthly Precipitation Totals from Weatherunderground to the right are incorrect as of August 7, 2013. With the sun shining on average between 240 and 253 days per year, Cancun is a year-round holiday destination, although certain times of year may be more favorable than others.
https://www.tripadvisor.com/Travel-g150807-s208/Cancun:Mexico:Weather.And.When.To.Go.html
In the opinion of someone who lives in Cancun, www.wunderground.com has the most accurate Cancun forecasts. During rainy season the forecasts may call for showers or thunderstorms every day, but keep in mind that most rain in Cancun is heavy but brief showers that pass quickly.
https://www.tripadvisor.com/Travel-g150807-s208/Cancun:Mexico:Weather.And.When.To.Go.html
Most of the time the weather in Cancun is beautiful. You can swim year-round, but you may have a specific climate in mind, which your family may find most attractive for a vacation. The average annual temperature of Cancun is 25.5 degrees Celsius [78 degrees F], with fluctuations of five to seven degrees.
https://travelyucatan.com/cancun-weather/
Best Times to Visit Cancun. The best time to visit Cancún is from December to April during the peak season. Even though the crowds are heavier, you'll experience near-perfect weather and find some of the cheapest flight and room rates for a winter getaway at the beach.
http://travel.usnews.com/Cancun_Mexico/When_To_Visit/
Cancun: Annual Weather Averages. June is the hottest month in Cancun with an average temperature of 28°C (82°F) and the coldest is January at 23°C (73°F) with the most daily sunshine hours at 11 in August. The wettest month is September with an average of 270mm of rain.
http://www.holiday-weather.com/cancun/averages/
The average temperature in Cancun is 80F (26C). January and February are the coolest months; June and July are the hottest. Even though the temperature does not vary that much throughout the year, there are 2 distinct seasons in Cancun.
http://www.cancunmx.com/weather/
(Editor's Note: The Monthly Precipitation Totals from Weatherunderground to the right are incorrect as of August 7, 2013. For the correct totals, please visit WeatherBase Cancun ) With the sun shining on average between 240 and 253 days per year, Cancun is a year-round holiday destination, although certain times of year may be more favorable than others. High season for travel falls between December and April.
https://www.tripadvisor.com/Travel-g150807-s208/Cancun:Mexico:Weather.And.When.To.Go.html
cancun weather by month
June is the hottest month in Cancun with an average temperature of 28 degrees Celsius or 82 degrees Fahrenheit  and the coldest is January at 23 degrees Celsius  or 73 degrees Fahrenheit  with the most daily sunshine hours at 11 in August. June is the hottest month in Cancun with an average temperature of 28 degrees Celsius and the coldest is January at 23 degrees Celsius with the most daily sunshine hours at 11 in August.