In September, the weather in Flekkefjord is typically warm. Average daily high temperature in September is about 13 degrees above zero. On average, Flekkefjord has 17 rainy, 7 sunny, 5 cloudy, and 1 partly cloudy day in September. The rains are usually heavy. September as well as January, February, March, and April is considered the most uncomfortable time to visit Flekkefjord.