San Onofre State Beach Swell ForecastUnited StatesCASan Diego CountySan Onofre State Beach1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIISan Onofre State Beach swell forecast issued today at 10:44 am. Next forecast at approx. 10:44 am.Get WillyWeather+ to remove ads