Southampton Water - River Itchen Entrance Rainfall ForecastUnited KingdomSEHampshireSouthampton Water - River Itchen EntranceToday 7 Sep5%Mon 8 Sep55%Tue 9 Sep20%Wed 10 Sep45%Thu 11 Sep45%Fri 12 Sep40%Sat 13 Sep20%Southampton Water - River Itchen Entrance rainfall forecast issued today at 1:38 pm. Next forecast at approx. 3:38 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