Columbia River - Government Island Rainfall ForecastUnited StatesORMultnomah CountyColumbia River - Government IslandToday 17 AprNo RainFri 18 AprNo RainSat 19 Apr10%Sun 20 Apr25%Mon 21 Apr10%Tue 22 AprNo RainWed 23 AprNo RainColumbia River - Government Island rainfall forecast issued today at 8:04 pm. Next forecast at approx. 10:04 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Portland RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads