If you're looking forward to lots of outings with your partner, check out these details about year-round temperatures in Sa Kaeo: The hottest months are usually March and April with an average temp of 84°F, while the coldest months are December and January with an average of 78°F. The rainiest months in Sa Kaeo are September, October, August, and July, with each month seeing an average of 9 inches of rainfall.