Black Sand Beach (Oneuli Beach) Swell ForecastUnited StatesHIMauiBlack Sand Beach (Oneuli Beach)1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIIBlack Sand Beach (Oneuli Beach) swell forecast issued today at 7:50 am. Next forecast at approx. 7:50 am.Get WillyWeather+ to remove ads