Chehalis River - Montesano Rainfall ForecastUnited StatesWAGrays Harbor CountyChehalis River - MontesanoToday 16 AprNo RainThu 17 AprNo RainFri 18 Apr5%Sat 19 Apr20%Sun 20 Apr35%Mon 21 Apr20%Tue 22 Apr10%Chehalis River - Montesano rainfall forecast issued today at 4:03 am. Next forecast at approx. 6:03 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Langley Hill RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads