Porthmadog Rainfall ForecastUnited KingdomWLGwyneddPorthmadogToday 18 Jul5%Sun 19 Jul5%Mon 20 Jul5%Tue 21 Jul15%Wed 22 Jul15%Thu 23 Jul10%1-Day3-Day5-Day Graph Plots Open in Graphs Rainfall Probability Forecast Met Office Rain Today Real-Time Porthmadog rainfall forecast issued today at 3:23 am. Next forecast at approx. . Rainfall Rainfall AccumulationCrug-y-Gorllwyn (Carmarthenshire) RadarGet WillyWeather+ to remove ads