Weather is probably a major factor when you plan your trip to Fai Kaeo, 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 82°F, while the coldest months are January and December with an average of 74°F. The rainiest months in Fai Kaeo are August, July, September, and June, with each month seeing an average of 12 inches of rainfall.