Planning for the weather is a good way to make your trip to Santa María Tonameca relaxing and enjoyable, especially when you’re splurging. The hottest months are usually April and March with an average temp of 78°F, while the coldest months are January and February with an average of 76°F. The rainiest months in Santa María Tonameca are September, June, August, and October, with each month seeing an average of 20 inches of rainfall.