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 31 degrees above zero. On average, Hua Hin has 25 rainy, 3 cloudy, 1 sunny, and 1 partly cloudy day in September. The rains are usually heavy. September as well as April, May, June, and July is considered the most uncomfortable time to visit Hua Hin.