Plum Island Rainfall ForecastUnited StatesILLa Salle CountyPlum IslandToday 18 Apr25%Sat 19 Apr65%Sun 20 Apr70%Mon 21 Apr90%Tue 22 Apr15%Wed 23 Apr30%Thu 24 Apr30%Plum Island rainfall forecast issued today at 8:08 am. Next forecast at approx. 10:08 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Chicago RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads