Theddlethorpe St Helen Swell ForecastUnited KingdomEMLincolnshireTheddlethorpe St Helen1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIITheddlethorpe St Helen swell forecast issued yesterday at 11:48 pm. Next forecast at approx. 11:48 pm.Get WillyWeather+ to remove ads