River Tamar - St John's Lake Entrance Rainfall ForecastUnited KingdomSWCornwallRiver Tamar - St John's Lake EntranceToday 7 Jun95%Sun 8 Jun5%Mon 9 Jun10%Tue 10 Jun25%Wed 11 Jun20%Thu 12 Jun20%Fri 13 Jun30%River Tamar - St John's Lake Entrance rainfall forecast issued today at 1:37 pm. Next forecast at approx. 3:37 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