Pen-y-Darren Rainfall ForecastUnited KingdomWLMerthyr TydfilPen-y-DarrenToday 9 May5%Sun 10 May5%Mon 11 May10%Tue 12 May15%Wed 13 May40%Thu 14 May35%Pen-y-Darren rainfall forecast issued today at 1:36 am. Next forecast at approx. 3:36 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