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 15 rainy, 11 snowy, 2 sunny, and 2 cloudy days in April. The rains are usually moderate. April as well as January, May, June, and July is considered the most uncomfortable time to visit Isafjordur.