Pen-y-Darren Rainfall ForecastUnited KingdomWLMerthyr TydfilPen-y-DarrenToday 24 Mar100%Wed 25 Mar80%Thu 26 Mar60%Fri 27 Mar85%Sat 28 Mar15%Sun 29 Mar80%Mon 30 Mar20%Pen-y-Darren rainfall forecast issued today at 6:37 pm. Next forecast at approx. 8:37 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