Māhukona Harbor Swell ForecastUnited StatesHIHawaiiMāhukona Harbor1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIIMāhukona Harbor swell forecast issued today at 7:45 am. Next forecast at approx. 7:45 am.Get WillyWeather+ to remove ads