September in Strahan is the windiest month of the year. In September, the weather in Strahan is typically warm. Average daily high temperature in September is about 12 degrees above zero. On average, Strahan has 22 rainy, 6 partly cloudy, and 2 sunny 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 Strahan.