Portsmouth Harbour - Portchester Lake Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Portchester LakeToday 3 Nov45%Tue 4 Nov85%Wed 5 Nov20%Thu 6 Nov20%Fri 7 Nov80%Sat 8 Nov5%Sun 9 Nov10%Portsmouth Harbour - Portchester Lake 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