June in Tainan is the cloudiest month of the year. In June, the weather in Tainan is typically hot. Average daily high temperature in June is about 31 degrees above zero. On average, Tainan has 16 rainy, 8 cloudy, 3 sunny, and 3 partly cloudy days in June. The rains are usually heavy. June as well as July, August, and September is considered the most uncomfortable time to visit Tainan.