In September, the weather in Shelbyville is typically warm. Average daily high temperature in September is about 25 degrees above zero. On average, Shelbyville has 13 sunny, 8 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 Shelbyville.