September in Chistopol is the rainiest month of the year. In September, the weather in Chistopol is typically warm. Average daily high temperature in September is about 15 degrees above zero. On average, Chistopol has 15 rainy, 10 cloudy, and 5 sunny days in September. The rains are usually moderate. September as well as January, February, April, and October is considered the most uncomfortable time to visit Chistopol.