Portsmouth Harbour - Whale Island Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Whale IslandToday 21 Oct40%Wed 22 Oct90%Thu 23 Oct55%Fri 24 Oct35%Sat 25 Oct10%Sun 26 Oct10%Portsmouth Harbour - Whale Island rainfall forecast issued today at 7:38 am. Next forecast at approx. 9:38 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Dean Hill (Wiltshire) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads