Flat Island Swell ForecastUnited StatesMEWashington CountyFlat Island1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIIFlat Island swell forecast issued today at 7:43 am. Next forecast at approx. 7:43 am. Wave Height Sea TemperatureGet WillyWeather+ to remove ads