March in Boise is the rainiest and the windiest month of the year. In March, the weather in Boise is typically cold. Average daily high temperature in March is about 9 degrees above zero. On average, Boise has 14 rainy, 9 partly cloudy, 7 sunny, and 1 cloudy day in March. The rains are usually moderate. March as well as January, February, November, and December is considered the most uncomfortable time to visit Boise.