In September, the weather in Ust-Abakan is typically warm. Average daily high temperature in September is about 13 degrees above zero. On average, Ust-Abakan has 13 rainy, 8 sunny, 7 partly cloudy, and 2 cloudy days in September. The rains are usually light. September as well as January, February, April, and October is considered the most uncomfortable time to visit Ust-Abakan.