September in Kiruna is the windiest month of the year. In September, the weather in Kiruna is typically cold. Average daily high temperature in September is about 9 degrees above zero. On average, Kiruna has 9 rainy, 8 cloudy, 7 partly cloudy, and 6 sunny days in September. The rains are usually moderate. September as well as January, February, April, and May is considered the most uncomfortable time to visit Kiruna.