In August, the weather in Ust-Cilma is typically warm. Average daily high temperature in August is about 15 degrees above zero. On average, Ust-Cilma has 14 rainy, 13 cloudy, 3 sunny, and 1 partly cloudy day in August. The rains are usually moderate. August as well as January, February, April, and May is considered the most uncomfortable time to visit Ust-Cilma.