June in Tsushima is the cloudiest month of the year. In June, the weather in Tsushima is typically warm. Average daily high temperature in June is about 25 degrees above zero. On average, Tsushima has 15 rainy, 8 cloudy, 4 sunny, and 3 partly 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 Tsushima.