Grand Isle Rainfall ForecastUnited StatesMEAroostook CountyGrand IsleToday 19 Apr100%Sun 20 Apr65%Mon 21 Apr5%Tue 22 Apr80%Wed 23 Apr70%Thu 24 Apr25%Fri 25 Apr25%Grand Isle rainfall forecast issued today at 7:04 pm. Next forecast at approx. 9:04 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Caribou RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads