In May, the weather in Rottenburg am Neckar is typically warm. Average daily high temperature in May is about 16 degrees above zero. On average, Rottenburg am Neckar has 18 rainy, 9 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 Rottenburg am Neckar.