Portsmouth Harbour - Inner Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - InnerToday 31 Mar80%Wed 1 Apr10%Thu 2 Apr10%Fri 3 Apr50%Sat 4 Apr25%Sun 5 Apr10%Portsmouth Harbour - Inner rainfall forecast issued today at 1:36 am. Next forecast at approx. 3:36 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