Trillium Lake Rainfall ForecastUnited StatesORClackamas CountyTrillium LakeToday 16 Apr5%Thu 17 AprNo RainFri 18 AprNo RainSat 19 Apr25%Sun 20 Apr35%Mon 21 Apr20%Tue 22 Apr5%Trillium Lake rainfall forecast issued today at 4:04 pm. Next forecast at approx. 6:04 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