Grass Valley City Park Rainfall ForecastUnited StatesORSherman CountyGrass Valley City ParkToday 18 Apr5%Sat 19 Apr20%Sun 20 AprNo RainMon 21 AprNo RainTue 22 AprNo RainWed 23 AprNo RainThu 24 Apr15%Grass Valley City Park rainfall forecast issued today at 6:05 pm. Next forecast at approx. 8:05 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Pendleton RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads