In July, the weather in Tehuacan is typically warm. Average daily high temperature in July is about 19 degrees above zero. On average, Tehuacan has 25 rainy, 3 sunny, 2 partly cloudy, and 1 cloudy day in July. The rains are usually heavy. July as well as May, June, August, and September is considered the most uncomfortable time to visit Tehuacan.