Granite Island Rainfall ForecastUnited StatesAKKenai Peninsula BoroughGranite IslandToday 21 Apr95%Tue 22 Apr95%Wed 23 Apr85%Thu 24 Apr60%Fri 25 Apr25%Sat 26 Apr35%Sun 27 Apr55%Granite Island rainfall forecast issued today at 9:04 am. Next forecast at approx. 11:04 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast NOAA Rain Today Real-Time Kenai RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads