San Joaquin River - San Joaquin Harbor Rainfall ForecastUnited StatesCAContra Costa CountySan Joaquin River - San Joaquin HarborToday 15 Apr5%Wed 16 Apr5%Thu 17 AprNo RainFri 18 AprNo RainSat 19 AprNo RainSun 20 AprNo RainMon 21 AprNo RainSan Joaquin River - San Joaquin Harbor rainfall forecast issued today at 10:03 am. Next forecast at approx. 12:03 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Sacramento RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads