Portsmouth Harbour - Whale Island Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Whale IslandToday 1 Apr10%Thu 2 Apr10%Fri 3 Apr10%Sat 4 Apr10%Sun 5 AprNo RainPortsmouth Harbour - Whale Island rainfall forecast issued today at 10:31 am. Next forecast at approx. 12:31 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time National RadarNational SatelliteNational SynopticGet an account to remove ads