Derwenlas Rainfall ForecastUnited KingdomWLPowysDerwenlasToday 17 May95%Mon 18 May90%Tue 19 May90%Wed 20 May85%Thu 21 May55%Fri 22 May55%Sat 23 May55%Derwenlas rainfall forecast issued today at 7:36 pm. Next forecast at approx. 9:36 am.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