Trefechan Rainfall ForecastUnited KingdomWLMerthyr TydfilTrefechanToday 15 Jul65%Wed 16 Jul80%Thu 17 Jul35%Fri 18 Jul40%Sat 19 Jul45%Sun 20 Jul40%Mon 21 Jul40%Trefechan rainfall forecast issued today at 7:37 pm. Next forecast at approx. 9:37 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