River Tamar - St John's Lake Entrance Rainfall ForecastUnited KingdomSWCornwallRiver Tamar - St John's Lake EntranceToday 8 Nov10%Sun 9 Nov90%Mon 10 Nov80%Tue 11 Nov80%Wed 12 Nov50%Thu 13 Nov20%Fri 14 Nov50%River Tamar - St John's Lake Entrance rainfall forecast issued today at 12:36 pm. Next forecast at approx. 2:36 am.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