River Tamar - St John's Lake Entrance Rainfall ForecastUnited KingdomSWCornwallRiver Tamar - St John's Lake EntranceToday 29 Apr95%Tue 30 Apr90%Wed 1 May30%Thu 2 May25%Fri 3 May15%Sat 4 May35%Sun 5 May45%River Tamar - St John's Lake Entrance rainfall forecast issued today at 1:38 pm. Next forecast at approx. 3:38 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Predannack (Cornwall) RadarNational SatelliteNational SynopticGet an account to remove ads