Sullivan's Island Swell ForecastUnited StatesSCCharleston CountySullivan's Island1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIISullivan's Island swell forecast issued today at 7:49 am. Next forecast at approx. 7:49 am.Get WillyWeather+ to remove ads