Pen-y-Darren Rainfall ForecastUnited KingdomWLMerthyr TydfilPen-y-DarrenToday 1 Jun65%Mon 2 Jun90%Tue 3 Jun95%Wed 4 Jun30%Thu 5 Jun85%Fri 6 Jun60%Pen-y-Darren rainfall forecast issued today at 7:37 am. Next forecast at approx. 9:37 pm.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