River Tamar - St John's Lake Entrance Rainfall ForecastUnited KingdomSWCornwallRiver Tamar - St John's Lake EntranceToday 27 Jun80%Sun 28 Jun15%Mon 29 Jun15%Tue 30 Jun30%Wed 1 Jul15%Thu 2 Jul15%Fri 3 JulNo RainRiver Tamar - St John's Lake Entrance rainfall forecast issued today at 7:35 pm. Next forecast at approx. 9:35 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Rainfall Rainfall AccumulationPredannack (Cornwall) RadarGet WillyWeather+ to remove ads