Weather will likely play an important role when you plan your trip to Jalpan de Serra, but bear in mind that cheaper options are usually available when the weather isn’t as good. The hottest months are usually May and June, with an average temperature of 24°C, while the coldest months are January and December, with an average of 17°C. The rainiest months in Jalpan de Serra are September, June, October and July, with each month seeing an average of 199 mm of rainfall.