Matanzas River Mouth (St Augustine Inlet) Swell ForecastUnited StatesFLSt Johns CountyMatanzas River Mouth (St Augustine Inlet)1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIIMatanzas River Mouth (St Augustine Inlet) swell forecast issued today at 12:48 am. Next forecast at approx. 12:48 am.Get WillyWeather+ to remove ads