In September, the weather in Gromyshevka is typically warm. Average daily high temperature in September is about 11 degrees above zero. On average, Gromyshevka has 12 rainy, 7 partly cloudy, 6 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 Gromyshevka.