August in Kiruna is the sunniest month of the year. In August, the weather in Kiruna is typically warm. Average daily high temperature in August is about 13 degrees above zero. On average, Kiruna has 13 rainy, 7 sunny, 7 partly cloudy, and 4 cloudy days in August. The rains are usually light. August as well as January, February, April, and May is considered the most uncomfortable time to visit Kiruna.