Weather will likely play an important role when you plan your trip to Sawaeng Ha, 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 87°F, while the coldest months are December and January with an average of 80°F. The rainiest months in Sawaeng Ha are September, October, August, and May, with each month seeing an average of 8 inches of rainfall.