May in Demänovska Dolina is the rainiest and the sunniest month of the year. In May, the weather in Demänovska Dolina is typically warm. Average daily high temperature in May is about 15 degrees above zero. On average, Demänovska Dolina has 17 rainy, 7 sunny, 5 partly cloudy, and 2 cloudy days in May. The rains are usually heavy. May as well as February, March, April, and June is considered the most uncomfortable time to visit Demänovska Dolina.