Portsmouth Harbour - M275 Motorway Bridge Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - M275 Motorway BridgeToday 28 Sep5%Tue 29 Sep10%Wed 30 Sep90%Thu 1 Oct15%Fri 2 Oct45%Portsmouth Harbour - M275 Motorway Bridge rainfall forecast issued today at 9:31 pm. Next forecast at approx. 11:31 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time National RadarNational SatelliteNational SynopticGet an account to remove ads