Other facts from our historical weather data: When is the rainy season in Sukhothai? Rainy season in Sukhothai occurs in the months of May, June, July, August, September and October. Does Sukhothai have a dry season? Yes, the months of January, February and December are very dry. Which is the hottest month in Sukhothai? April has an average maximum temperature of 40°C (104°F) and is the hottest month of the year. Which is the coolest month in Sukhothai? The coolest month is January with an average maximum temperature of 33°C (91°F). Which is the wettest month in Sukhothai? September tops the wettest month list with 275mm (10.8 in) of rainfall. Which is the driest month in Sukhothai? December is the driest month with 15mm (0.6 in) of precipitation. Which is the sunniest month in Sukhothai? March is the sunniest month with an average of 277 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.