Grant Marsh Wildlife Management Area Rainfall ForecastUnited StatesMTBig Horn CountyGrant Marsh Wildlife Management AreaToday 19 Apr15%Sun 20 Apr55%Mon 21 Apr90%Tue 22 Apr50%Wed 23 Apr25%Thu 24 Apr35%Fri 25 Apr40%Grant Marsh Wildlife Management Area 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 Billings RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads