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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the StoryShift weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Porthmadog sits at the edge of Snowdonia National Park on the Cambrian Coast, giving it a notably wetter climate than much of lowland Wales, though May through September offer the best chance of dry, settled weather for exploring the harbour and surrounding mountains.
When is the best time to visit Porthmadog?
For the most reliable weather in Porthmadog, plan your trip between May and September. July and August bring the warmest temperatures and longest daylight hours, ideal for the Ffestiniog Railway or a coastal walk. The live forecast above gives a clearer picture of conditions for the days ahead. Spring and autumn are quieter but expect more rain — the town averages over 130mm of rainfall in both October and January. Winter visits appeal to walkers seeking empty trails, though be prepared for gales and heavy showers.
What should you pack for Porthmadog?
A waterproof jacket and sturdy footwear are essential year-round, even if the live forecast above looks promising. Layers work well: a fleece or mid-layer under a shell gives you flexibility as the wind changes. In summer, add sun cream and a hat — the coast can catch strong sunshine between showers. For winter, pack a warm coat, gloves and a windproof layer. School holidays and bank holidays draw crowds, so book accommodation early if you plan to visit during August or Easter.
Is Porthmadog wetter than the rest of Wales?
Yes. Its position at the edge of Snowdonia means moist Atlantic air rises and cools over the mountains, producing more rainfall than coastal towns further south. You can check the weather porthmadog met office feed for daily rainfall totals.
What is the weather in Porthmadog tomorrow likely to be?
The live forecast above is the best guide, but generally expect a mix of cloud and showers, with temperatures around 6–8°C in winter and 14–18°C in summer. The weather in porthmadog tomorrow often reflects the wider north-west Wales pattern of Atlantic fronts.
Does the sea mist affect Porthmadog often?
Sea fog and haar can drift into the harbour during spring and early summer, especially when warm air passes over a cold sea. It usually clears by midday. The weather porthmadog 7 days forecast on BBC and Met Office will flag any persistent mist.
For a wider look at conditions across the country, visit our UK weather hub or check the 10 day weather forecast UK for longer-range planning.