Portsmouth Harbour - Whale Island Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Whale IslandToday 20 May5%Thu 21 May5%Fri 22 May5%Sat 23 May5%Sun 24 MayNo RainMon 25 MayNo RainPortsmouth Harbour - Whale Island rainfall forecast issued yesterday 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