Pen-y-Darren Rainfall ForecastUnited KingdomWLMerthyr TydfilPen-y-DarrenToday 8 Feb80%Mon 9 Feb90%Tue 10 Feb85%Wed 11 Feb80%Thu 12 Feb50%Fri 13 Feb40%Pen-y-Darren rainfall forecast issued yesterday at 6:36 pm. Next forecast at approx. 8:36 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