In May, the weather in Ust-Serta is typically warm. Average daily high temperature in May is about 13 degrees above zero. On average, Ust-Serta has 15 rainy, 8 cloudy, 5 sunny, and 3 partly cloudy days in May. The rains are usually moderate. May as well as January, February, April, and September is considered the most uncomfortable time to visit Ust-Serta.