May in Belluno is the rainiest month of the year. In May, the weather in Belluno is typically warm. Average daily high temperature in May is about 16 degrees above zero. On average, Belluno has 24 rainy, 6 sunny, and 1 partly 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 Belluno.