Portsmouth Harbour Entrance Rainfall ForecastUnited KingdomSEHampshirePortsmouth Harbour EntranceToday 16 Feb35%Tue 17 Feb40%Wed 18 Feb75%Thu 19 Feb10%Fri 20 Feb50%Sat 21 Feb15%Portsmouth Harbour Entrance rainfall forecast issued today at 12:36 am. Next forecast at approx. 2:36 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