January in Bad Arolsen is the cloudiest and the coldest month of the year. In January, the weather in Bad Arolsen is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Bad Arolsen has 21 rainy, 8 cloudy, and 2 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 Bad Arolsen.