Pen-y-Darren Rainfall ForecastUnited KingdomWLMerthyr TydfilPen-y-DarrenToday 17 Sep90%Thu 18 Sep60%Fri 19 Sep55%Sat 20 Sep85%Sun 21 Sep30%Mon 22 Sep5%Tue 23 Sep5%Pen-y-Darren rainfall forecast issued today at 7:37 pm. Next forecast at approx. 9:37 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