Sankaty Head Lighthouse Swell ForecastUnited StatesMANantucket CountySankaty Head Lighthouse1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIISankaty Head Lighthouse swell forecast issued today at 7:44 pm. Next forecast at approx. 7:44 pm.Get WillyWeather+ to remove ads