O'Brien Rainfall ForecastUnited StatesCAShasta CountyO'BrienToday 19 Apr5%Sun 20 Apr5%Mon 21 AprNo RainTue 22 Apr5%Wed 23 Apr10%Thu 24 Apr20%Fri 25 Apr30%O'Brien rainfall forecast issued today at 12:04 am. Next forecast at approx. 2:04 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Medford RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads