Mill River Park Rainfall ForecastUnited StatesORClackamas CountyMill River ParkToday 21 Apr20%Tue 22 AprNo RainWed 23 AprNo RainThu 24 Apr35%Fri 25 Apr55%Sat 26 Apr50%Sun 27 Apr35%Mill River Park rainfall forecast issued today at 7:04 am. Next forecast at approx. 9:04 pm.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