In September, the weather in Ust-Bolshereck is typically warm. Average daily high temperature in September is about 12 degrees above zero. On average, Ust-Bolshereck has 19 rainy, 5 cloudy, 4 sunny, and 2 partly cloudy days in September. The rains are usually heavy. September as well as May, August, October, and November is considered the most uncomfortable time to visit Ust-Bolshereck.