September in Valerianovsk is the cloudiest month of the year. In September, the weather in Valerianovsk is typically warm. Average daily high temperature in September is about 12 degrees above zero. On average, Valerianovsk has 11 rainy, 8 cloudy, 8 partly cloudy, and 3 sunny days in September. The rains are usually moderate. September as well as January, February, October, and December is considered the most uncomfortable time to visit Valerianovsk.