Cwmtaf Rainfall ForecastUnited KingdomWLMerthyr TydfilCwmtafToday 16 Dec45%Wed 17 Dec100%Thu 18 Dec95%Fri 19 Dec75%Sat 20 Dec85%Sun 21 Dec20%Mon 22 Dec15%Cwmtaf rainfall forecast issued today at 12:38 pm. Next forecast at approx. 2:38 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