If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Ko Mak: The hottest months are usually April and March with an average temp of 81°F, while the coldest months are January and February with an average of 78°F. The rainiest months in Ko Mak are September, July, August, and June, with each month seeing an average of 20 inches of rainfall.