Portsmouth Harbour - Portchester Lake Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - Portchester LakeToday 26 Apr85%Sat 27 Apr75%Sun 28 Apr80%Mon 29 Apr5%Tue 30 Apr15%Wed 1 May15%Portsmouth Harbour - Portchester Lake rainfall forecast issued yesterday at 7:38 pm. Next forecast at approx. 9:38 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 an account to remove ads