In September, the weather in Ust-Cilma is typically warm. Average daily high temperature in September is about 10 degrees above zero. On average, Ust-Cilma has 13 rainy, 10 cloudy, 4 partly cloudy, and 3 sunny days in September. The rains are usually moderate. September as well as January, February, October, and December is considered the most uncomfortable time to visit Ust-Cilma.