In March, the weather in Colchester is typically cold. Average daily high temperature in March is about 2 degrees above zero. On average, Colchester has 14 cloudy, 10 rainy, 4 sunny, 2 partly cloudy, and 1 snowy day in March. The rains are usually moderate. March as well as April, May, October, and November is considered the most uncomfortable time to visit Colchester.