Saint Johns River Mouth Swell ForecastUnited StatesFLDuval CountySaint Johns River Mouth1-Day3-Day5-Day Graph Plots Open in GraphsSwell Height and Direction Forecast NOAA WaveWatch IIISwell Period Forecast NOAA WaveWatch IIISaint Johns River Mouth swell forecast issued today at 1:13 am. Next forecast at approx. 1:13 am.Get an account to remove ads