In September, the weather in Southport is typically warm. Average daily high temperature in September is about 20 degrees above zero. On average, Southport has 12 sunny, 8 rainy, 7 partly cloudy, and 3 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 Southport.