River Tamar - St John's Lake Entrance Rainfall ForecastUnited KingdomSWCornwallRiver Tamar - St John's Lake EntranceToday 12 Feb75%Fri 13 Feb75%Sat 14 Feb90%Sun 15 Feb85%Mon 16 Feb40%Tue 17 Feb75%Wed 18 Feb45%River Tamar - St John's Lake Entrance rainfall forecast issued today at 6:36 am. Next forecast at approx. 8:36 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Predannack (Cornwall) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads