In May, the weather in Sosnovoborsk is typically warm. Average daily high temperature in May is about 13 degrees above zero. On average, Sosnovoborsk has 16 rainy, 6 cloudy, 5 sunny, and 4 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 Sosnovoborsk.