Southampton Water - River Itchen Entrance Rainfall ForecastUnited KingdomSEHampshireSouthampton Water - River Itchen EntranceToday 3 Nov80%Tue 4 Nov85%Wed 5 Nov50%Thu 6 Nov15%Fri 7 Nov60%Sat 8 Nov5%Southampton Water - River Itchen Entrance rainfall forecast issued today at 6:36 am. Next forecast at approx. 8:36 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