Johnson Lake Rainfall ForecastUnited StatesMTGranite CountyJohnson LakeToday 19 Apr50%Sun 20 Apr65%Mon 21 Apr90%Tue 22 Apr15%Wed 23 Apr30%Thu 24 Apr35%Fri 25 Apr50%Johnson Lake 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