In September, the weather in Prachuap Khiri Khan is typically hot. Average daily high temperature in September is about 29 degrees above zero. On average, Prachuap Khiri Khan has 18 rainy, 10 cloudy, 1 sunny, and 1 partly cloudy day in September. The rains are usually moderate. September as well as May, July, and October is considered the most uncomfortable time to visit Prachuap Khiri Khan.