In May, the weather in Ust-Bolshereck is typically cold. Average daily high temperature in May is about 7 degrees above zero. On average, Ust-Bolshereck has 19 cloudy, 10 rainy, and 2 sunny days in May. The rains are usually moderate. May as well as August, September, October, and November is considered the most uncomfortable time to visit Ust-Bolshereck.