Planning for the weather is a good way to make your trip to Mompiche relaxing and enjoyable, especially when you’re splurging. 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.