Pen-y-Darren Rainfall ForecastUnited KingdomWLMerthyr TydfilPen-y-DarrenToday 25 Oct95%Sun 26 Oct90%Mon 27 Oct25%Tue 28 Oct45%Wed 29 Oct45%Thu 30 Oct80%Fri 31 Oct70%Pen-y-Darren rainfall forecast issued today at 1:36 pm. Next forecast at approx. 2:36 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