September in Nanortalik is the rainiest month of the year. In September, the weather in Nanortalik is typically cold. Average daily high temperature in September is about 5 degrees above zero. On average, Nanortalik has 15 rainy, 7 sunny, 5 partly cloudy, and 3 cloudy 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 Nanortalik.