Weather will likely play an important role when you plan your trip to Zacatlán, and keep in mind that cheaper options are usually available when the weather isn’t as good. The hottest months are usually May and April with an average temp of 65°F, while the coldest months are January and February with an average of 56°F. The rainiest months in Zacatlán are September, June, July, and August, with each month seeing an average of 15 inches of rainfall.