Porton Down Rainfall ForecastUnited KingdomSWWiltshirePorton DownToday 21 Jun65%Sun 22 Jun50%Mon 23 Jun35%Tue 24 Jun15%Wed 25 Jun15%Thu 26 Jun55%Porton Down rainfall forecast issued today at 7:37 am. Next forecast at approx. 9:37 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