September in Aguascalientes is the cloudiest month of the year. In September, the weather in Aguascalientes is typically warm. Average daily high temperature in September is about 22 degrees above zero. On average, Aguascalientes has 22 rainy, 4 sunny, 2 cloudy, and 2 partly cloudy days in September. The rains are usually moderate. September as well as July and August is considered the most uncomfortable time to visit Aguascalientes.