In April, the weather in Ust'-Sema is typically cold. Average daily high temperature in April is about 8 degrees above zero. On average, Ust'-Sema has 17 rainy, 8 sunny, 4 partly cloudy, and 1 cloudy day in April. The rains are usually moderate. April as well as January, May, and October is considered the most uncomfortable time to visit Ust'-Sema.