June in Ishigaki is the cloudiest month of the year. In June, the weather in Ishigaki is typically hot. Average daily high temperature in June is about 28 degrees above zero. On average, Ishigaki has 17 rainy, 5 cloudy, 5 partly cloudy, and 3 sunny days in June. The rains are usually heavy. June as well as January, February, May, and August is considered the most uncomfortable time to visit Ishigaki.