If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Mompiche: The hottest months are usually April and May with an average temp of 78°F, while the coldest months are August and September with an average of 77°F. The rainiest months in Mompiche are January, February, April, and March, with each month seeing an average of 9 inches of rainfall.