Other facts from our historical weather data: When is the rainy season in Chom Thong? Rainy season in Chom Thong occurs in the months of May, June, July, August and September. Does Chom Thong have a dry season? Yes, the months of January, February and December are very dry. Which is the hottest month in Chom Thong? April has an average maximum temperature of 37°C (99°F) and is the hottest month of the year. Which is the coolest month in Chom Thong? The coolest month is January with an average maximum temperature of 30°C (86°F). Which is the wettest month in Chom Thong? August tops the wettest month list with 247mm (9.7 in) of rainfall. Which is the driest month in Chom Thong? February is the driest month with 7mm (0.3 in) of precipitation. Which is the sunniest month in Chom Thong? March is the sunniest month with an average of 295 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.