Merthyr Tydfil Rainfall ForecastUnited KingdomWLMerthyr TydfilMerthyr TydfilToday 4 Dec100%Thu 5 Dec95%Fri 6 Dec85%Sat 7 Dec50%Sun 8 Dec10%Mon 9 Dec10%Merthyr Tydfil rainfall forecast issued today at 6:38 am. Next forecast at approx. 8:38 pm.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