March in Watertown is the windiest month of the year. In March, the weather in Watertown is typically cold. Average daily high temperature in March is about 3 degrees above zero. On average, Watertown has 11 sunny, 9 partly cloudy, 6 cloudy, 3 snowy, and 2 rainy days in March. The snowfalls are usually light. March as well as April and November is considered the most uncomfortable time to visit Watertown.