April in Ust'-Sema is the windiest month of the year. In April, the weather in Ust'-Sema is typically warm. Average daily high temperature in April is about 10 degrees above zero. On average, Ust'-Sema has 9 sunny, 9 partly cloudy, 8 rainy, 2 snowy, and 2 cloudy days in April. The rains are usually heavy. April as well as January, March, May, and June is considered the most uncomfortable time to visit Ust'-Sema.