Merthyr Tydfil Rainfall ForecastUnited KingdomWLMerthyr TydfilMerthyr TydfilToday 22 Jul5%Thu 23 Jul5%Fri 24 Jul5%Sat 25 Jul55%Sun 26 Jul50%Mon 27 Jul45%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Merthyr Tydfil rainfall forecast issued today at 2:38 am. Next forecast at approx. . Rainfall Rainfall AccumulationCrug-y-Gorllwyn (Carmarthenshire) RadarGet WillyWeather+ to remove ads