March in Harstad is the windiest and the cloudiest month of the year. In March, the weather in Harstad is typically freezing. Average daily high temperature in March is about zero. On average, Harstad has 15 snowy, 8 rainy, 4 sunny, 2 cloudy, and 2 partly cloudy days in March. The snowfalls are usually heavy. March as well as April, May, June, and July is considered the most uncomfortable time to visit Harstad.