Portlandoo Harbour Swell ForecastUnited KingdomNIColerainePortlandoo Harbour1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIIPortlandoo Harbour swell forecast issued yesterday at 11:49 pm. Next forecast at approx. 11:49 pm.Get WillyWeather+ to remove ads