Monongahela Rainfall ForecastUnited StatesPAWashington CountyMonongahelaToday 19 Apr65%Sun 20 Apr30%Mon 21 Apr60%Tue 22 Apr55%Wed 23 Apr10%Thu 24 Apr20%Fri 25 Apr50%Monongahela rainfall forecast issued today at 8:04 am. Next forecast at approx. 10:04 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Pittsburgh RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads