March in Sierra Nevada is the rainiest month of the year. In March, the weather in Sierra Nevada is typically warm. Average daily high temperature in March is about 14 degrees above zero. On average, Sierra Nevada has 13 sunny, 10 rainy, 5 partly cloudy, and 3 cloudy days in March. The rains are usually moderate. March as well as January, February, April, and November is considered the most uncomfortable time to visit Sierra Nevada.