Portsmouth Harbour - M275 Motorway Bridge Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - M275 Motorway BridgeToday 23 Jan10%Fri 24 Jan10%Sat 25 Jan10%Sun 26 Jan20%Mon 27 Jan80%Portsmouth Harbour - M275 Motorway Bridge rainfall forecast issued today at 2:31 am. Next forecast at approx. 4:31 pm.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