Portsmouth Harbour - HMNB Portsmouth Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - HMNB PortsmouthToday 26 Apr85%Sat 27 Apr90%Sun 28 Apr75%Mon 29 AprNo RainTue 30 Apr10%Wed 1 May15%Thu 2 May15%Portsmouth Harbour - HMNB Portsmouth rainfall forecast issued today 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