Saint Johns River - Mayport Naval Station Rainfall ForecastUnited StatesFLDuval CountySaint Johns River - Mayport Naval StationToday 16 Apr10%Thu 17 AprNo RainFri 18 AprNo RainSat 19 AprNo RainSun 20 AprNo RainMon 21 Apr10%Tue 22 Apr25%Saint Johns River - Mayport Naval Station rainfall forecast issued today at 7:04 am. Next forecast at approx. 9:04 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Jacksonville RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads