Old St Mellons Rainfall ForecastUnited KingdomWLCardiffOld St MellonsToday 25 Apr45%Fri 26 Apr55%Sat 27 Apr45%Sun 28 Apr15%Mon 29 Apr15%Tue 30 Apr45%Wed 1 May50%Old St Mellons rainfall forecast issued today at 7:38 pm. Next forecast at approx. 9:38 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Cobbacombe Cross (Devon) RadarNational SatelliteNational SynopticGet an account to remove ads