If you're looking forward to lots of outings with your partner, check out these details about year-round temperatures in Mainpat: The hottest months are usually May and April with an average temp of 85°F, while the coldest months are January and December with an average of 65°F. The rainiest months in Mainpat are July, August, September, and June, with each month seeing an average of 14 inches of rainfall.