St Merryn Rainfall ForecastUnited KingdomSWCornwallSt MerrynToday 15 May20%Fri 16 May15%Sat 17 MayNo RainSun 18 MayNo RainMon 19 May5%Tue 20 May5%Wed 21 MayNo RainSt Merryn rainfall forecast issued today at 1:39 pm. Next forecast at approx. 3:39 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