Derwenlas Rainfall ForecastUnited KingdomWLPowysDerwenlasToday 2 Apr95%Fri 3 Apr90%Sat 4 Apr95%Sun 5 Apr30%Mon 6 Apr10%Tue 7 Apr50%Wed 8 Apr80%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