Portsmouth Harbour - Whale Island Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Whale IslandToday 7 Sep40%Mon 8 Sep40%Tue 9 Sep30%Wed 10 Sep45%Thu 11 Sep40%Fri 12 Sep40%Portsmouth Harbour - Whale Island rainfall forecast issued today at 1:36 am. Next forecast at approx. 3:36 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