September in Beitostolen is the windiest month of the year. In September, the weather in Beitostolen is typically cold. Average daily high temperature in September is about 9 degrees above zero. On average, Beitostolen has 15 rainy, 7 partly cloudy, 5 cloudy, and 3 sunny days in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Beitostolen.