December in Miyako-jima is the windiest month of the year. In December, the weather in Miyako-jima is typically warm. Average daily high temperature in December is about 21 degrees above zero. On average, Miyako-jima has 19 rainy, 5 sunny, 4 cloudy, and 3 partly cloudy days in December. The rains are usually heavy. December as well as January, February, May, and October is considered the most uncomfortable time to visit Miyako-jima.