September in Tuxtla Gutiérrez is the rainiest and the cloudiest month of the year. In September, the weather in Tuxtla Gutiérrez is typically warm. Average daily high temperature in September is about 26 degrees above zero. On average, Tuxtla Gutiérrez has 29 rainy and 1 sunny day in September. The rains are usually heavy. September as well as June, July, and August is considered the most uncomfortable time to visit Tuxtla Gutiérrez.