March in Washington is the rainiest month of the year. In March, the weather in Washington is typically cold. Average daily high temperature in March is about 8 degrees above zero. On average, Washington has 13 rainy, 7 sunny, 6 partly cloudy, and 5 cloudy days in March. The rains are usually heavy. March as well as January, February, April, and December is considered the most uncomfortable time to visit Washington.