In September, the weather in Ust-Kamenogorsk is typically warm. Average daily high temperature in September is about 20 degrees above zero. On average, Ust-Kamenogorsk has 14 sunny, 8 rainy, and 8 partly cloudy days in September. The rains are usually light. September as well as August is considered the most comfortable time to visit Ust-Kamenogorsk.