In July, the weather in Isafjordur is typically cold. Average daily high temperature in July is about 9 degrees above zero. On average, Isafjordur has 17 rainy, 9 cloudy, 3 sunny, and 2 partly cloudy days in July. The rains are usually moderate. July as well as January, April, May, and June is considered the most uncomfortable time to visit Isafjordur.