May in Ust-Ozernaya is the windiest month of the year. In May, the weather in Ust-Ozernaya is typically warm. Average daily high temperature in May is about 13 degrees above zero. On average, Ust-Ozernaya has 12 partly cloudy, 8 sunny, 6 rainy, and 5 cloudy days in May. The rains are usually light.