Granite State Park Rainfall ForecastUnited StatesMTGranite CountyGranite State ParkToday 19 Apr20%Sun 20 Apr55%Mon 21 Apr85%Tue 22 Apr15%Wed 23 Apr25%Thu 24 Apr30%Fri 25 Apr40%Granite 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 Missoula RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads