In September, the weather in Egilsstaðir is typically cold. Average daily high temperature in September is about 7 degrees above zero. On average, Egilsstaðir has 25 rainy, 3 cloudy, and 2 sunny days in September. The rains are usually heavy. September as well as April, May, June, and July is considered the most uncomfortable time to visit Egilsstaðir.