September in Kamenno-Angarsk is the rainiest month of the year. In September, the weather in Kamenno-Angarsk is typically warm. Average daily high temperature in September is about 12 degrees above zero. On average, Kamenno-Angarsk has 16 rainy, 9 sunny, and 5 partly cloudy days in September. The rains are usually moderate. September as well as January, February, April, and October is considered the most uncomfortable time to visit Kamenno-Angarsk.