In September, the weather in Kotzebue is typically cold. Average daily high temperature in September is about 7 degrees above zero. On average, Kotzebue has 10 partly cloudy, 9 sunny, 7 rainy, and 4 cloudy days in September. The rains are usually light. September as well as January, February, March, and November is considered the most uncomfortable time to visit Kotzebue.