September in Columbus is the sunniest month of the year. In September, the weather in Columbus is typically warm. Average daily high temperature in September is about 26 degrees above zero. On average, Columbus has 18 sunny, 7 rainy, and 5 partly 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 Columbus.