August in Chumphon is the rainiest month of the year. In August, the weather in Chumphon is typically hot. Average daily high temperature in August is about 30 degrees above zero. On average, Chumphon has 29 rainy and 2 cloudy days in August. The rains are usually moderate. August as well as April, May, June, and July is considered the most uncomfortable time to visit Chumphon.