Southampton Rainfall ForecastUnited KingdomSEHampshireSouthamptonToday 16 Sep5%Tue 17 SepNo RainWed 18 Sep5%Thu 19 Sep5%Fri 20 Sep40%Sat 21 Sep30%Sun 22 Sep35%Southampton 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