Ystradgynlais Rainfall ForecastUnited KingdomWLPowysYstradgynlaisToday 1 Oct45%Fri 2 Oct85%Sat 3 Oct35%Sun 4 Oct55%Mon 5 Oct45%Tue 6 Oct40%Wed 7 Oct10%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Ystradgynlais rainfall forecast issued today at 7:09 pm. Next forecast at approx. 9:09 am. Rainfall Rainfall AccumulationCrug-y-Gorllwyn (Carmarthenshire) RadarGet WillyWeather+ to remove ads