River Blackwater - Osea Island Rainfall ForecastUnited KingdomEEEssexRiver Blackwater - Osea IslandToday 16 Sep95%Wed 17 Sep90%Thu 18 Sep10%Fri 19 Sep10%Sat 20 Sep15%Sun 21 Sep15%River Blackwater - Osea Island rainfall forecast issued today at 1:36 am. Next forecast at approx. 3:36 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Thurnham (Kent) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads