March in Southport is the windiest month of the year. In March, the weather in Southport is typically cold. Average daily high temperature in March is about 4 degrees above zero. On average, Southport has 10 sunny, 10 partly cloudy, 5 rainy, 5 cloudy, and 1 snowy day in March. The rains are usually heavy. March as well as January, February, April, and May is considered the most uncomfortable time to visit Southport.