Treharris Rainfall ForecastUnited KingdomWLMerthyr TydfilTreharrisToday 15 Jul95%Wed 16 Jul75%Thu 17 Jul20%Fri 18 Jul45%Sat 19 Jul55%Sun 20 Jul50%Mon 21 Jul35%Treharris 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 Cobbacombe Cross (Devon) RadarNational SatelliteNational SynopticGet WillyWeather+ to remove ads