Treharris Rainfall ForecastUnited KingdomWLMerthyr TydfilTreharrisToday 2 Oct85%Sat 3 Oct10%Sun 4 Oct20%Mon 5 Oct20%Tue 6 Oct35%Wed 7 Oct10%Thu 8 Oct15%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Treharris rainfall forecast issued today at 1:09 pm. Next forecast at approx. 3:09 am. Rainfall Rainfall AccumulationCobbacombe Cross (Devon) RadarGet WillyWeather+ to remove ads