Portsmouth Harbour - Pewit Island Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Pewit IslandToday 7 Jun80%Sun 8 Jun35%Mon 9 Jun5%Tue 10 Jun5%Wed 11 Jun20%Thu 12 Jun20%Portsmouth Harbour - Pewit Island rainfall forecast issued today at 1:37 am. Next forecast at approx. 3:37 pm.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