January in Watford is the coldest month of the year. In January, the weather in Watford is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Watford has 11 rainy, 8 cloudy, 8 partly cloudy, and 4 sunny days in January. The rains are usually moderate. January as well as February, March, April, and October is considered the most uncomfortable time to visit Watford.