Porton Down Rainfall ForecastUnited KingdomSWWiltshirePorton DownToday 16 Apr55%Fri 17 Apr55%Sat 18 Apr5%Sun 19 Apr5%Mon 20 Apr10%Tue 21 Apr15%Wed 22 Apr5%Porton Down rainfall forecast issued today at 7:36 am. Next forecast at approx. 9:36 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