September in Kodiak is the sunniest month of the year. In September, the weather in Kodiak is typically warm. Average daily high temperature in September is about 11 degrees above zero. On average, Kodiak has 18 rainy, 8 sunny, 3 partly cloudy, and 1 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 Kodiak.