September in Koromyslovka is the rainiest month of the year. In September, the weather in Koromyslovka is typically warm. Average daily high temperature in September is about 16 degrees above zero. On average, Koromyslovka has 14 rainy, 8 sunny, 5 partly cloudy, and 3 cloudy days in September. The rains are usually light. September as well as January, February, March, and April is considered the most uncomfortable time to visit Koromyslovka.