January in Sejdisfjordur is the cloudiest month of the year. In January, the weather in Sejdisfjordur is typically freezing. Average daily high temperature in January is about zero. On average, Sejdisfjordur has 15 snowy, 12 rainy, 2 sunny, and 2 cloudy days in January. The snowfalls are usually heavy. January as well as March, April, May, and June is considered the most uncomfortable time to visit Sejdisfjordur.