Trefechan Rainfall ForecastUnited KingdomWLMerthyr TydfilTrefechanToday 1 May85%Sat 2 May80%Sun 3 May65%Mon 4 May30%Tue 5 May10%Wed 6 May10%Thu 7 May10%Trefechan rainfall forecast issued today at 1:36 pm. Next forecast at approx. 3:36 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