Portsmouth Harbour - Pewit Island Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Pewit IslandToday 12 Sep75%Sat 13 Sep40%Sun 14 Sep95%Mon 15 Sep40%Tue 16 Sep15%Wed 17 Sep80%Thu 18 Sep10%Portsmouth Harbour - Pewit 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