January in Leuven is the coldest month of the year. In January, the weather in Leuven is typically cold. Average daily high temperature in January is about 4 degrees above zero. On average, Leuven has 17 rainy, 8 cloudy, 4 sunny, and 2 partly cloudy days in January. The rains are usually moderate. January as well as February, November, and December is considered the most uncomfortable time to visit Leuven.