Weather will likely play an important role when you plan your trip to Huamantla, 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 16°C, while the coldest months are January and December, with an average of 12°C. The rainiest months in Huamantla are August, September, July and June, with each month seeing an average of 249 mm of rainfall.