Weather will likely play an important role when you plan your trip to Tha Sa-at, but bear 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 temperature of 28°C, while the coldest months are January and December, with an average of 22°C. The rainiest months in Tha Sa-at are August, September, July and May, with each month seeing an average of 270 mm of rainfall.