Bass River - South Yarmouth Rainfall ForecastUnited StatesMABarnstable CountyBass River - South YarmouthToday 19 Apr45%Sun 20 Apr20%Mon 21 Apr5%Tue 22 Apr55%Wed 23 Apr5%Thu 24 Apr5%Fri 25 Apr20%Bass River - South Yarmouth rainfall forecast issued today at 6:04 pm. Next forecast at approx. 8:04 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Boston RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads