In March, the weather in Sundsvall is typically cold. Average daily high temperature in March is about 1 degree above zero. On average, Sundsvall has 9 cloudy, 9 partly cloudy, 6 rainy, 6 sunny, and 1 snowy day in March. The rains are usually light. March as well as April, October, and November is considered the most uncomfortable time to visit Sundsvall.