Pen-y-Darren Rainfall ForecastUnited KingdomWLMerthyr TydfilPen-y-DarrenToday 12 JulNo RainSun 13 Jul10%Mon 14 Jul40%Tue 15 Jul70%Wed 16 Jul55%Thu 17 Jul40%Fri 18 Jul30%Pen-y-Darren rainfall forecast issued today at 7:36 am. Next forecast at approx. 9:36 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