Upper Isabel Lake Rainfall ForecastUnited StatesMTFlathead CountyUpper Isabel LakeToday 18 Apr20%Sat 19 Apr30%Sun 20 Apr85%Mon 21 Apr95%Tue 22 Apr75%Wed 23 Apr35%Thu 24 Apr30%Upper Isabel Lake rainfall forecast issued today at 6:04 pm. Next forecast at approx. 8:04 am.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