Weather will likely play an important role when you plan your trip to Mae Hong Son, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and March with an average temp of 77°F, while the coldest months are January and February with an average of 67°F. The rainiest months in Mae Hong Son are August, July, September, and June, with each month seeing an average of 11 inches of rainfall.