Portsmouth Harbour - M275 Motorway Bridge Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - M275 Motorway BridgeToday 9 Apr50%Fri 10 Apr45%Sat 11 Apr55%Sun 12 Apr35%Mon 13 Apr35%Tue 14 Apr10%Wed 15 Apr10%Portsmouth Harbour - M275 Motorway Bridge rainfall forecast issued today at 1:36 pm. Next forecast at approx. 3:36 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 WillyWeather+ to remove ads