May in Slomniki is the rainiest month of the year. In May, the weather in Slomniki is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Slomniki has 18 rainy, 9 sunny, 3 partly cloudy, and 1 cloudy day in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Slomniki.