September in Hua Hin is the rainiest month of the year. In September, the weather in Hua Hin is typically hot. Average daily high temperature in September is about 30 degrees above zero. On average, Hua Hin has 28 rainy and 2 cloudy days in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Hua Hin.