There are good conditions for visiting in May in Surfside Beach. The daily temperatures in this month reach pleasant 26 °C (80 °F). The seawater temperature reaches ideal 22 °C (72 °F). You can expect just 9 days of rain during the month, taking an umbrella is not necessary. The temperature of 15 °C (59 °F) at night may make it better to dine inside or to put on more clothes for a dinner outside.