Portsmouth Harbour - Pewit Island Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Pewit IslandToday 1 Jan50%Fri 2 Jan50%Sat 3 JanNo RainSun 4 Jan5%Mon 5 Jan10%Tue 6 Jan40%Wed 7 Jan35%Portsmouth Harbour - Pewit Island rainfall forecast issued today at 6:36 pm. Next forecast at approx. 8:36 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