Taking into account the local weather in Tlacotepec de Mejía can help you maximize your time at the pool during your trip. The hottest months are usually April and May with an average temp of 67°F, while the coldest months are January and February with an average of 59°F. The rainiest months in Tlacotepec de Mejía are September, June, August, and May, with each month seeing an average of 11 inches of rainfall.