If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Mae Hong Son: The hottest months are usually April and March, with an average temperature of 25°C, while the coldest months are January and February, with an average of 20°C. The rainiest months in Mae Hong Son are August, July, September and June, with each month seeing an average of 286 mm of rainfall.