In September, the weather in Kaohsiung is typically hot. Average daily high temperature in September is about 31 degrees above zero. On average, Kaohsiung has 13 rainy, 8 sunny, 8 partly cloudy, and 1 cloudy day in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Kaohsiung.