If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Kaeng Krachan: The hottest months are usually April and May with an average temp of 84°F, while the coldest months are January and December with an average of 79°F. The rainiest months in Kaeng Krachan are September, October, July, and August, with each month seeing an average of 8 inches of rainfall.