Penrhyn Cwmistir Rainfall ForecastUnited KingdomWLGwyneddPenrhyn CwmistirToday 13 Nov10%Fri 14 Nov95%Sat 15 Nov10%Sun 16 Nov10%Mon 17 Nov25%Tue 18 Nov35%Penrhyn Cwmistir rainfall forecast issued today at 6:36 am. Next forecast at approx. 8:36 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