Portsmouth Harbour - Royal Clarence Marina Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Royal Clarence MarinaToday 18 Feb90%Thu 19 Feb20%Fri 20 Feb60%Sat 21 Feb50%Sun 22 Feb75%Mon 23 Feb20%Portsmouth Harbour - Royal Clarence Marina rainfall forecast issued today at 6:36 am. Next forecast at approx. 8:36 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