September in Zacatecas is the cloudiest month of the year. In September, the weather in Zacatecas is typically warm. Average daily high temperature in September is about 20 degrees above zero. On average, Zacatecas has 21 rainy, 6 cloudy, and 3 sunny days in September. The rains are usually heavy. September as well as July and August is considered the most uncomfortable time to visit Zacatecas.