River Blackwater - Osea Island Rainfall ForecastUnited KingdomEEEssexRiver Blackwater - Osea IslandToday 17 Mar5%Wed 18 MarNo RainThu 19 MarNo RainFri 20 Mar5%Sat 21 Mar5%Sun 22 Mar5%River Blackwater - Osea Island rainfall forecast issued today at 12:36 am. Next forecast at approx. 2:36 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