Saint Charles Rainfall ForecastUnited StatesMOSt Charles CountySaint CharlesToday 16 Apr10%Thu 17 Apr65%Fri 18 Apr40%Sat 19 Apr85%Sun 20 Apr70%Mon 21 Apr55%Tue 22 Apr25%Saint Charles rainfall forecast issued today at 12:04 pm. Next forecast at approx. 2:04 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time St Louis RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads