Planning for the weather is an important factor for making your trip to Santo Domingo Tonala a success, especially when you're splurging. The hottest months are usually April and May with an average temp of 67°F, while the coldest months are January and December with an average of 60°F. The rainiest months in Santo Domingo Tonala are September, August, June, and July, with each month seeing an average of 12 inches of rainfall.