Porthmadog Rainfall ForecastUnited KingdomWLGwyneddPorthmadogToday 17 Oct5%Sun 18 Oct50%Mon 19 Oct30%Tue 20 Oct60%Wed 21 Oct75%Thu 22 Oct75%Fri 23 Oct40%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Porthmadog rainfall forecast issued today at 7:08 pm. Next forecast at approx. 9:08 am. Rainfall Rainfall AccumulationCrug-y-Gorllwyn (Carmarthenshire) RadarGet WillyWeather+ to remove ads