May in Freiburg im Breisgau is the rainiest month of the year. In May, the weather in Freiburg im Breisgau is typically warm. Average daily high temperature in May is about 17 degrees above zero. On average, Freiburg im Breisgau has 20 rainy, 7 sunny, and 4 partly cloudy days in May. The rains are usually heavy. May as well as January, February, March, and April is considered the most uncomfortable time to visit Freiburg im Breisgau.