River Blackwater - Osea Island Rainfall ForecastUnited KingdomEEEssexRiver Blackwater - Osea IslandToday 3 Dec10%Thu 4 Dec55%Fri 5 Dec80%Sat 6 Dec35%Sun 7 Dec60%Mon 8 Dec55%River Blackwater - Osea Island rainfall forecast issued today at 6:35 am. Next forecast at approx. 8:35 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