January in Leverkusen is the coldest month of the year. In January, the weather in Leverkusen is typically cold. Average daily high temperature in January is about 5 degrees above zero. On average, Leverkusen has 14 rainy, 7 cloudy, 6 partly cloudy, and 4 sunny days in January. The rains are usually heavy. January as well as February, March, October, and November is considered the most uncomfortable time to visit Leverkusen.