March in Sejdisfjordur is the sunniest month of the year. In March, the weather in Sejdisfjordur is typically freezing. Average daily high temperature in March is about 1 degree above zero. On average, Sejdisfjordur has 10 cloudy, 7 snowy, 7 partly cloudy, 4 sunny, and 3 rainy days in March. The snowfalls are usually heavy.