Portsmouth Harbour - Whale Island Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Whale IslandToday 15 Jul10%Wed 16 Jul5%Thu 17 Jul5%Fri 18 Jul35%Sat 19 Jul45%Sun 20 Jul30%Mon 21 Jul55%Portsmouth Harbour - Whale Island rainfall forecast issued today at 7:37 pm. Next forecast at approx. 9:37 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