This shear resulted in weakening, though the JTWC estimated the typhoon still had winds of as the storm passed approximately west of Kadena Air Base on the afternoon of August 29. Dinah then leveled off in intensity as the storm entered the Sea of Japan, and on August 30, Dinah began to recurve to the north-northeast. That day, the typhoon passed northwest of Sasebo Naval Base in western Japan while transitioning into an extratropical cyclone. By 00:00 UTC on August 31, Dinah began to merge with a frontal zone near the polar jet stream. Several hours later, the JTWC stopped monitoring the system as it completed its extratropical transition, but the JMA continuing to track the extratropical remnants of Dinah until September 3, when it crossed the International Date Line. The storm lashed Okinawa Prefecture with strong winds of , and gusts of . The lowest sea level pressure observed on the island was , although offshore, a ship measured a pressure of . The capital of Okinawa, Naha, recorded of rain, including during one day; both of these totals were the highest reported across Japan. All ferry and airline service to Japan from Naha was halted. Throughout the capital of Okinawa, 13 fishing boats were damaged and three houses were destroyed. Throughout Okinawa, six people were injured, including one who required brief hospitalization from cuts as a result of flying glass. Police reported that eight houses were seriously damaged or destroyed. One person was killed and damage exceeded $1.3 million. Offshore, a ferry also sank, and a vessel and another ferry went aground. In all, Dinah was considered the worst tropical cyclone to affect Okinawa in 20 years. Along Kyushu, 250 homes were flooded and about 450,000 homeowners lost power. Off the coast of Kyushu, a vessel went aground and 41 boats were sunk. Throughout southwestern Japan, storm surge resulted in extensive damage to seawalls and piers. A landing craft from the was destroyed when the seawall eroded and the pier collapsed. Damage to United States military bases in the archipelago totaled $6.7 million. Nationwide, 37,0768 homes were destroyed, with 611 others flooded. A total of of crops was flooded and 79 ships were damaged due to Dinah. Eight people perished, and 89 others were hurt. Damage in Japan amounted to $604 million.