Other facts from our historical weather data: When is the rainy season in Mae Hong Son? Rainy season in Mae Hong Son occurs in the months of May, June, July, August and September. Does Mae Hong Son have a dry season? Yes, the months of January, February, March and December are very dry. Which is the hottest month in Mae Hong Son? 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 Hong Son? The coolest month is January with an average maximum temperature of 29°C (84°F). Which is the wettest month in Mae Hong Son? August tops the wettest month list with 288mm (11.3 in) of rainfall. Which is the driest month in Mae Hong Son? February is the driest month with 4mm (0.2 in) of precipitation. 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.