January in Rottenburg am Neckar is the snowiest, the cloudiest, and the coldest month of the year. In January, the weather in Rottenburg am Neckar is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Rottenburg am Neckar has 14 rainy, 10 cloudy, 4 sunny, 2 partly cloudy, and 1 snowy day in January. The rains are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Rottenburg am Neckar.