In September, the weather in Ust-Cilma is typically cold. Average daily high temperature in September is about 9 degrees above zero. On average, Ust-Cilma has 18 rainy, 11 cloudy, and 1 sunny 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-Cilma.