Lake San Marcos Rainfall ForecastUnited StatesCASan Diego CountyLake San MarcosToday 18 Apr10%Sat 19 AprNo RainSun 20 AprNo RainMon 21 AprNo RainTue 22 AprNo RainWed 23 AprNo RainThu 24 AprNo RainLake San Marcos 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 San Diego RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads