In September, the weather in Ust-Tym is typically warm. Average daily high temperature in September is about 10 degrees above zero. On average, Ust-Tym has 15 rainy, 12 cloudy, 2 sunny, and 1 partly cloudy day in September. The rains are usually moderate. September as well as January, February, April, and May is considered the most uncomfortable time to visit Ust-Tym.