Southampton Water - River Test Entrance Rainfall ForecastUnited KingdomSEHampshireSouthampton Water - River Test EntranceToday 7 Sep15%Mon 8 Sep35%Tue 9 Sep20%Wed 10 Sep45%Thu 11 Sep45%Fri 12 Sep40%Southampton Water - River Test Entrance rainfall forecast issued today at 1:36 am. Next forecast at approx. 3:36 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