Opihi Rock Swell ForecastUnited StatesHIHawaiiOpihi Rock1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIIOpihi Rock swell forecast issued yesterday at 7:46 pm. Next forecast at approx. 7:46 pm. Wave Height Sea TemperatureGet WillyWeather+ to remove ads