Big Rock Forest Preserve Rainfall ForecastUnited StatesILKane CountyBig Rock Forest PreserveToday 20 Apr80%Mon 21 Apr95%Tue 22 Apr20%Wed 23 Apr50%Thu 24 Apr35%Fri 25 Apr55%Sat 26 Apr35%Big Rock Forest Preserve 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 Chicago RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads