In April, the weather in Isafjordur is typically cold. Average daily high temperature in April is about 1 degree above zero. On average, Isafjordur has 10 cloudy, 10 partly cloudy, 5 rainy, 3 snowy, and 2 sunny days in April. The rains are usually moderate. April as well as January, February, May, and June is considered the most uncomfortable time to visit Isafjordur.