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