September in Quezaltenango is the coldest month of the year. In September, the weather in Quezaltenango is typically warm. Average daily high temperature in September is about 18 degrees above zero. On average, Quezaltenango has 30 rainy days in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Quezaltenango.