Trefechan Rainfall ForecastUnited KingdomWLMerthyr TydfilTrefechanToday 14 Dec95%Mon 15 Dec95%Tue 16 Dec20%Wed 17 Dec90%Thu 18 Dec95%Fri 19 Dec55%Trefechan rainfall forecast issued today at 6:36 am. Next forecast at approx. 8:36 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