Washington County Lake Rainfall ForecastUnited StatesILWashington CountyWashington County LakeToday 18 Apr25%Sat 19 Apr90%Sun 20 Apr80%Mon 21 Apr85%Tue 22 AprNo RainWed 23 Apr20%Thu 24 Apr50%Washington County Lake rainfall forecast issued today at 10:04 pm. Next forecast at approx. 12:04 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time St Louis RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads