May in Sinsk is the rainiest and the windiest month of the year. In May, the weather in Sinsk is typically cold. Average daily high temperature in May is about 10 degrees above zero. On average, Sinsk has 15 rainy, 9 cloudy, 4 sunny, and 3 partly cloudy days in May. The rains are usually moderate. May as well as January, February, March, and September is considered the most uncomfortable time to visit Sinsk.