May in Staroye Slavkino is the rainiest month of the year. In May, the weather in Staroye Slavkino is typically warm. Average daily high temperature in May is about 19 degrees above zero. On average, Staroye Slavkino has 13 rainy, 9 sunny, 8 partly cloudy, and 1 cloudy day in May. The rains are usually moderate.