September in Cold Bay is the rainiest month of the year. In September, the weather in Cold Bay is typically warm. Average daily high temperature in September is about 10 degrees above zero. On average, Cold Bay has 21 rainy, 6 cloudy, 2 partly cloudy, and 1 sunny day in September. The rains are usually heavy. September as well as April, May, June, and July is considered the most uncomfortable time to visit Cold Bay.