You might spend a lot of your vacation inside, but if you're planning to venture beyond the casino, looking at local weather trends is a good idea. The hottest months are usually March and April with an average temp of 83°F, while the coldest months are January and December with an average of 80°F. The rainiest months in Kampot are September, July, October, and June, with each month seeing an average of 11 inches of rainfall.