Porton Down Rainfall ForecastUnited KingdomSWWiltshirePorton DownToday 1 Jun95%Tue 2 Jun70%Wed 3 Jun60%Thu 4 Jun65%Fri 5 Jun35%Sat 6 Jun45%Sun 7 Jun10%Porton Down 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