September in Pionersky is the rainiest month of the year. In September, the weather in Pionersky is typically warm. Average daily high temperature in September is about 12 degrees above zero. On average, Pionersky has 15 rainy, 13 cloudy, and 2 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 Pionersky.