Other facts from our historical weather data: When is the rainy season in Mae On? Rainy season in Mae On occurs in the months of May, June, July, August and September. Does Mae On have a dry season? Yes, the months of January, February and December are very dry. Which is the hottest month in Mae On? 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 Mae On? The coolest month is January with an average maximum temperature of 29°C (84°F). Which is the wettest month in Mae On? August tops the wettest month list with 359mm (14.1 in) of rainfall. Which is the driest month in Mae On? February is the driest month with 9mm (0.4 in) of precipitation. Which is the sunniest month in Mae On? 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.