May in Krosno is the rainiest month of the year. In May, the weather in Krosno is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Krosno has 17 rainy, 9 sunny, 3 partly cloudy, and 2 cloudy days in May. The rains are usually heavy. May as well as February, March, April, and November is considered the most uncomfortable time to visit Krosno.