Portsmouth Harbour - Whale Island Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Whale IslandToday 19 Sep50%Sun 20 Sep5%Mon 21 SepNo RainTue 22 Sep5%Wed 23 Sep5%Thu 24 Sep5%Fri 25 Sep5%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Portsmouth Harbour - Whale Island rainfall forecast issued today at 1:10 pm. Next forecast at approx. 3:10 am. Rainfall Rainfall AccumulationDean Hill (Wiltshire) RadarGet WillyWeather+ to remove ads