In September, the weather in Pervomayskiy is typically warm. Average daily high temperature in September is about 13 degrees above zero. On average, Pervomayskiy has 13 rainy, 13 cloudy, 3 sunny, and 1 partly cloudy day in September. The rains are usually moderate. September as well as January, April, October, and November is considered the most uncomfortable time to visit Pervomayskiy.