Weather will likely play an important role when you plan your trip to Phatthalung, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and April with an average temp of 81°F, while the coldest months are January and February with an average of 79°F. The rainiest months in Phatthalung are September, October, November, and May, with each month seeing an average of 12 inches of rainfall.