Black Rock Harbor Number Three Light Swell ForecastUnited StatesCTFairfield CountyBlack Rock Harbor Number Three Light1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIIBlack Rock Harbor Number Three Light swell forecast issued yesterday at 6:48 pm. Next forecast at approx. 6:48 pm. Wave Height Sea TemperatureGet WillyWeather+ to remove ads