Heolgerrig Rainfall ForecastUnited KingdomWLMerthyr TydfilHeolgerrigToday 5 JanNo RainTue 6 Jan70%Wed 7 Jan25%Thu 8 Jan80%Fri 9 Jan55%Sat 10 Jan85%Heolgerrig rainfall forecast issued today at 12:36 am. Next forecast at approx. 2:36 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