Harrow on the Hill Rainfall ForecastUnited KingdomSEGreater LondonHarrow on the HillToday 26 Sep10%Sun 27 Sep55%Mon 28 Sep15%Tue 29 Sep50%Wed 30 Sep50%Thu 1 Oct10%Fri 2 OctNo Rain1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Harrow on the Hill rainfall forecast issued today at 7:09 am. Next forecast at approx. 9:09 pm. Rainfall Rainfall AccumulationChenies (Hertfordshire) RadarGet WillyWeather+ to remove ads