In May, the weather in Prachuap Khiri Khan is typically hot. Average daily high temperature in May is about 30 degrees above zero. On average, Prachuap Khiri Khan has 17 rainy, 6 cloudy, 5 partly cloudy, and 3 sunny days in May. The rains are usually moderate. May as well as July, September, and October is considered the most uncomfortable time to visit Prachuap Khiri Khan.