Derwenlas Rainfall ForecastUnited KingdomWLPowysDerwenlasToday 2 Jul10%Fri 3 Jul25%Sat 4 Jul35%Sun 5 Jul20%Mon 6 Jul20%Tue 7 Jul20%Derwenlas rainfall forecast issued today at 1:37 am. Next forecast at approx. 3:37 pm.1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Rainfall Rainfall AccumulationCrug-y-Gorllwyn (Carmarthenshire) RadarGet WillyWeather+ to remove ads