In June, the weather in Sejdisfjordur is typically warm. Average daily high temperature in June is about 10 degrees above zero. On average, Sejdisfjordur has 12 rainy, 9 partly cloudy, 6 cloudy, and 3 sunny days in June. The rains are usually moderate. June as well as April, May, July, and August is considered the most uncomfortable time to visit Sejdisfjordur.