Ystradgynlais Rainfall ForecastUnited KingdomWLPowysYstradgynlaisToday 16 Aug50%Mon 17 Aug85%Tue 18 Aug50%Wed 19 Aug55%Thu 20 Aug60%Fri 21 Aug30%Sat 22 Aug10%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 am. Next forecast at approx. 9:09 pm. Rainfall Rainfall AccumulationCrug-y-Gorllwyn (Carmarthenshire) RadarGet WillyWeather+ to remove ads