Portsmouth Harbour - Whale Island Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Whale IslandToday 16 Sep95%Wed 17 Sep85%Thu 18 Sep10%Fri 19 Sep15%Sat 20 Sep45%Sun 21 Sep45%Mon 22 Sep35%Portsmouth Harbour - Whale Island rainfall forecast issued today at 7:36 pm. Next forecast at approx. 9:36 am.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