If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Muak Lek: The hottest months are usually April and March with an average temp of 86°F, while the coldest months are December and January with an average of 79°F. The rainiest months in Muak Lek are September, August, July, and October, with each month seeing an average of 9 inches of rainfall.