Weather will likely play an important role when you plan your trip to Tepotzotlán, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and May, with an average temperature of 18°C, while the coldest months are January and December, with an average of 14°C. The rainiest months in Tepotzotlán are August, July, September and June, with each month seeing an average of 186 mm of rainfall.