May in Usole-Sibirskoe is the windiest month of the year. In May, the weather in Usole-Sibirskoe is typically warm. Average daily high temperature in May is about 14 degrees above zero. On average, Usole-Sibirskoe has 13 partly cloudy, 8 sunny, 6 rainy, and 4 cloudy days in May. The rains are usually light.