Boulder Rainfall ForecastUnited StatesMTJefferson CountyBoulderToday 19 Apr20%Sun 20 Apr45%Mon 21 Apr85%Tue 22 Apr20%Wed 23 Apr25%Thu 24 Apr30%Fri 25 Apr35%Boulder 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 Great Falls RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads