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 1:48 pm. Next forecast at approx. 1:48 pm.Get WillyWeather+ to remove ads