Pen-y-Darren Rainfall ForecastUnited KingdomWLMerthyr TydfilPen-y-DarrenToday 24 Dec5%Thu 25 DecNo RainFri 26 DecNo RainSat 27 Dec10%Sun 28 Dec15%Mon 29 Dec15%Tue 30 Dec10%Pen-y-Darren rainfall forecast issued today at 12:37 pm. Next forecast at approx. 2:37 am.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Crug-y-Gorllwyn (Carmarthenshire) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads