St Merryn Rainfall ForecastUnited KingdomSWCornwallSt MerrynToday 29 Mar40%Sat 30 Mar75%Sun 31 Mar45%Mon 1 Apr45%Tue 2 Apr75%Wed 3 Apr75%St Merryn rainfall forecast issued today at 6:42 am. Next forecast at approx. 8:42 pm.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