September in Rankin Inlet is the cloudiest month of the year. In September, the weather in Rankin Inlet is typically cold. Average daily high temperature in September is about 7 degrees above zero. On average, Rankin Inlet has 13 cloudy, 8 rainy, 7 partly cloudy, and 2 sunny days in September. The rains are usually moderate. September as well as January, February, March, and April is considered the most uncomfortable time to visit Rankin Inlet.