Long Island Rainfall ForecastUnited KingdomSWCornwallLong IslandToday 19 May15%Tue 20 May45%Wed 21 May50%Thu 22 May5%Fri 23 May20%Sat 24 May50%Long Island rainfall forecast issued today at 1:37 am. Next forecast at approx. 3:37 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Predannack (Cornwall) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads