Big Trinity Lake Rainfall ForecastUnited StatesIDElmore CountyBig Trinity LakeToday 19 Apr10%Sun 20 Apr5%Mon 21 Apr20%Tue 22 AprNo RainWed 23 Apr10%Thu 24 Apr15%Fri 25 Apr40%Big Trinity Lake rainfall forecast issued today at 5:04 pm. Next forecast at approx. 7:04 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Boise RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads