Merthyr Rainfall ForecastUnited KingdomWLCarmarthenshireMerthyrToday 5 Nov55%Fri 6 Nov50%Sat 7 Nov35%Sun 8 Nov15%Mon 9 Nov15%Tue 10 Nov75%Wed 11 Nov45%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Merthyr rainfall forecast issued today at 6:11 pm. Next forecast at approx. 8:11 am. Rainfall Rainfall AccumulationCrug-y-Gorllwyn (Carmarthenshire) RadarGet WillyWeather+ to remove ads