September in Springfield is the sunniest month of the year. In September, the weather in Springfield is typically warm. Average daily high temperature in September is about 26 degrees above zero. On average, Springfield has 14 sunny, 7 rainy, 7 partly cloudy, and 2 cloudy days in September. The rains are usually heavy. September as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Springfield.