January in Herborn is the coldest month of the year. In January, the weather in Herborn is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Herborn has 15 rainy, 12 cloudy, and 4 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 Herborn.