September in Haines is the rainiest month of the year. In September, the weather in Haines is typically cold. Average daily high temperature in September is about 8 degrees above zero. On average, Haines has 25 rainy, 3 sunny, and 2 cloudy days in September. The rains are usually heavy. September as well as April, May, June, and July is considered the most uncomfortable time to visit Haines.