January in Isafjordur is the cloudiest month of the year. In January, the weather in Isafjordur is typically freezing. Average daily high temperature in January is about zero. On average, Isafjordur has 22 snowy, 8 rainy, and 1 sunny day in January. The snowfalls are usually heavy. January as well as April, May, June, and July is considered the most uncomfortable time to visit Isafjordur.