May in Southport is the rainiest and the cloudiest month of the year. In May, the weather in Southport is typically warm. Average daily high temperature in May is about 13 degrees above zero. On average, Southport has 15 rainy, 6 sunny, 6 partly cloudy, and 4 cloudy days in May. The rains are usually heavy. May as well as February, March, April, and December is considered the most uncomfortable time to visit Southport.