September in Bolshoy Bitaman is the rainiest month of the year. In September, the weather in Bolshoy Bitaman is typically warm. Average daily high temperature in September is about 14 degrees above zero. On average, Bolshoy Bitaman has 16 rainy, 10 cloudy, and 4 sunny days in September. The rains are usually moderate. September as well as January, April, October, and November is considered the most uncomfortable time to visit Bolshoy Bitaman.