Arroyo Rainfall ForecastUnited StatesPRArroyoArroyoToday 21 Apr20%Tue 22 Apr20%Wed 23 Apr20%Thu 24 Apr10%Fri 25 Apr70%Sat 26 Apr70%Sun 27 Apr60%Arroyo 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 San Juan RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads