Blackwater Rainfall ForecastUnited KingdomSEHampshireBlackwaterToday 19 Nov10%Thu 20 Nov5%Fri 21 Nov10%Sat 22 Nov80%Sun 23 Nov50%Mon 24 Nov15%Tue 25 Nov15%Blackwater rainfall forecast issued today at 6:38 pm. Next forecast at approx. 8:38 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