Lewis & Clark Caverns State Park Rainfall ForecastUnited StatesMTJefferson CountyLewis & Clark Caverns State ParkToday 19 Apr15%Sun 20 Apr70%Mon 21 Apr80%Tue 22 Apr15%Wed 23 Apr20%Thu 24 Apr25%Fri 25 Apr25%Lewis & Clark Caverns State Park rainfall forecast issued today at 3:04 am. Next forecast at approx. 5:04 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Great Falls RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads