Portsmouth Harbour - Pewit Island Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Pewit IslandToday 18 Sep10%Fri 19 Sep10%Sat 20 Sep55%Sun 21 Sep10%Mon 22 Sep10%Tue 23 Sep5%Wed 24 Sep5%Portsmouth Harbour - Pewit Island rainfall forecast issued today at 1:37 pm. Next forecast at approx. 3:37 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