Pen-y-Darren Rainfall ForecastUnited KingdomWLMerthyr TydfilPen-y-DarrenToday 25 Jun65%Fri 26 Jun10%Sat 27 Jun60%Sun 28 Jun60%Mon 29 Jun10%Tue 30 Jun30%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) Radar Rainfall Rainfall AccumulationGet WillyWeather+ to remove ads