Portsmouth Harbour - M275 Motorway Bridge Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour - M275 Motorway BridgeToday 9 Jan25%Sat 10 Jan10%Sun 11 Jan90%Mon 12 Jan50%Tue 13 Jan80%Wed 14 Jan50%Portsmouth Harbour - M275 Motorway Bridge rainfall forecast issued today at 6:37 am. Next forecast at approx. 8:37 pm.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