September in Harrisonburg is the sunniest month of the year. In September, the weather in Harrisonburg is typically warm. Average daily high temperature in September is about 22 degrees above zero. On average, Harrisonburg has 16 sunny, 11 partly cloudy, 2 rainy, and 1 cloudy day in September. The rains are usually light. September as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Harrisonburg.