June in Osaka is the cloudiest month of the year. In June, the weather in Osaka is typically warm. Average daily high temperature in June is about 27 degrees above zero. On average, Osaka has 14 rainy, 8 partly cloudy, 4 sunny, and 4 cloudy days in June. The rains are usually heavy. June as well as January, February, March, and July is considered the most uncomfortable time to visit Osaka.