Blacktail Reservoir Rainfall ForecastUnited StatesMTRosebud CountyBlacktail ReservoirToday 19 AprNo RainSun 20 Apr40%Mon 21 Apr85%Tue 22 Apr45%Wed 23 Apr15%Thu 24 Apr30%Fri 25 Apr35%Blacktail Reservoir 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