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