July in Ust-Cilma is the sunniest and the warmest month of the year. In July, the weather in Ust-Cilma is typically warm. Average daily high temperature in July is about 19 degrees above zero. On average, Ust-Cilma has 10 partly cloudy, 8 cloudy, 7 rainy, and 6 sunny days in July. The rains are usually light.