Pen-y-Darren Rainfall ForecastUnited KingdomWLMerthyr TydfilPen-y-DarrenToday 21 Sep5%Tue 22 Sep10%Wed 23 Sep55%Thu 24 Sep20%Fri 25 Sep20%Sat 26 Sep10%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Pen-y-Darren rainfall forecast issued yesterday at 7:08 pm. Next forecast at approx. 9:08 am. Rainfall Rainfall AccumulationCrug-y-Gorllwyn (Carmarthenshire) RadarGet WillyWeather+ to remove ads