Treharris Rainfall ForecastUnited KingdomWLMerthyr TydfilTreharrisToday 3 JanNo RainSun 4 Jan60%Mon 5 Jan5%Tue 6 Jan55%Wed 7 Jan20%Thu 8 Jan45%Fri 9 Jan20%Treharris 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 Cobbacombe Cross (Devon) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads