Saint Johns River Mouth Swell ForecastUnited StatesFLDuval CountySaint Johns River Mouth1-Day3-Day5-Day Graph Plots Open in Graphs Swell Height and Direction Forecast NOAA WaveWatch III Swell Period Forecast NOAA WaveWatch IIISaint Johns River Mouth swell forecast issued today at 7:41 am. Next forecast at approx. 7:41 am.Get an account to remove ads