Merthyr Dyfan Rainfall ForecastUnited KingdomWLVale of GlamorganMerthyr DyfanToday 15 Sep10%Wed 16 Sep65%Thu 17 Sep45%Fri 18 Sep60%Sat 19 Sep50%Sun 20 Sep10%Mon 21 Sep15%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Merthyr Dyfan rainfall forecast issued today at 1:09 pm. Next forecast at approx. 3:09 am. Rainfall Rainfall AccumulationCobbacombe Cross (Devon) RadarGet WillyWeather+ to remove ads