July in Tainan is the rainiest and the hottest month of the year. In July, the weather in Tainan is typically hot. Average daily high temperature in July is about 32 degrees above zero. On average, Tainan has 18 rainy, 6 sunny, 5 cloudy, and 2 partly cloudy days in July. The rains are usually heavy. July as well as June, August, and September is considered the most uncomfortable time to visit Tainan.