July in Miyako-jima is the sunniest and the hottest month of the year. In July, the weather in Miyako-jima is typically hot. Average daily high temperature in July is about 29 degrees above zero. On average, Miyako-jima has 15 rainy, 9 sunny, 4 cloudy, and 3 partly cloudy days in July. The rains are usually heavy. July as well as January, February, March, and May is considered the most uncomfortable time to visit Miyako-jima.