Derwenlas Rainfall ForecastUnited KingdomWLPowysDerwenlasToday 2 Oct95%Sat 3 Oct10%Sun 4 Oct65%Mon 5 Oct65%Tue 6 Oct60%Wed 7 Oct15%Thu 8 Oct50%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Derwenlas rainfall forecast issued today at 1:09 pm. Next forecast at approx. 3:09 am. Rainfall Rainfall AccumulationCrug-y-Gorllwyn (Carmarthenshire) RadarGet WillyWeather+ to remove ads