January in Regensburg is the snowiest, the cloudiest, and the coldest month of the year. In January, the weather in Regensburg is typically cold. Average daily high temperature in January is about 1 degree above zero. On average, Regensburg has 18 cloudy, 9 rainy, 3 sunny, and 1 snowy day in January. The rains are usually moderate. January as well as February and December is considered the most uncomfortable time to visit Regensburg.