May in Salzburg is the rainiest month of the year. In May, the weather in Salzburg is typically warm. Average daily high temperature in May is about 18 degrees above zero. On average, Salzburg has 18 rainy, 7 sunny, 3 cloudy, and 3 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 Salzburg.