September in Haines is the rainiest, the windiest, and the cloudiest month of the year. In September, the weather in Haines is typically warm. Average daily high temperature in September is about 11 degrees above zero. On average, Haines has 22 rainy, 4 cloudy, 2 sunny, and 2 partly cloudy days in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Haines.