In March, the weather in Southport is typically cold. Average daily high temperature in March is about 3 degrees above zero. On average, Southport has 12 partly cloudy, 9 rainy, 7 sunny, 2 cloudy, and 1 snowy day in March. The rains are usually moderate. March as well as February, April, May, and December is considered the most uncomfortable time to visit Southport.