August in Ust-Bolshereck is the warmest month of the year. In August, the weather in Ust-Bolshereck is typically warm. Average daily high temperature in August is about 15 degrees above zero. On average, Ust-Bolshereck has 18 rainy, 11 cloudy, and 2 sunny days in August. The rains are usually heavy. August as well as May, September, October, and November is considered the most uncomfortable time to visit Ust-Bolshereck.