Harpenden Rainfall ForecastUnited KingdomEEHertfordshireHarpendenToday 11 Aug50%Tue 12 AugNo RainWed 13 Aug10%Thu 14 Aug5%Fri 15 Aug5%Sat 16 Aug5%Sun 17 Aug5%Harpenden rainfall forecast issued today at 1:36 pm. Next forecast at approx. 3:36 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Chenies (Hertfordshire) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads