May in Sireniki is the cloudiest month of the year. In May, the weather in Sireniki is typically freezing. Average daily high temperature in May is about zero. On average, Sireniki has 14 cloudy, 8 rainy, 5 snowy, 3 sunny, and 1 partly cloudy day in May. The rains are usually light. May as well as January, February, March, and June is considered the most uncomfortable time to visit Sireniki.