Weather is probably a major factor when you plan your trip to Kamphaeng Phet, 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 84°F, while the coldest months are January and December with an average of 75°F. The rainiest months in Kamphaeng Phet are September, August, July, and May, with each month seeing an average of 8 inches of rainfall.