In September, the weather in Chemdal'sk is typically cold. Average daily high temperature in September is about 8 degrees above zero. On average, Chemdal'sk has 15 rainy, 9 cloudy, 4 sunny, and 2 partly cloudy days in September. The rains are usually light. September as well as January, February, April, and May is considered the most uncomfortable time to visit Chemdal'sk.