January in Bielefeld is the rainiest, the cloudiest, and the coldest month of the year. In January, the weather in Bielefeld is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Bielefeld has 21 rainy, 7 cloudy, and 3 sunny days in January. The rains are usually moderate. January as well as February, March, November, and December is considered the most uncomfortable time to visit Bielefeld.