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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Reading Wire weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The live forecast above shows today’s conditions for Porthmadog, with a mix of cloud, occasional drizzle and a moderate south-westerly breeze – fairly typical for this coastal corner of Gwynedd in early spring.
What makes Porthmadog’s weather different from inland Wales?
Porthmadog’s position on the Glaslyn estuary, sheltered by the Lleyn Peninsula to the west and Snowdonia to the east, creates a local microclimate. The sea moderates temperatures, keeping winters milder and summers cooler than nearby inland towns. However, the surrounding hills can trap cloud and bring prolonged spells of drizzle, especially when winds blow from the Atlantic.
How reliable are the longer-range forecasts for Porthmadog?
Five-day forecasts tend to be dependable for general trends, but localised showers can arrive unexpectedly because of the complex terrain. For a broader picture of what’s coming, see the 10-day forecast for the UK or the main UK weather hub.
When is the best time to visit Porthmadog for fine weather?
Late spring (May–June) and early autumn (September) offer the best balance of mild temperatures and lower rainfall. July and August can be pleasant, but the area still gets its share of showery days.
Does Porthmadog get snow?
Snow is uncommon on the coast because of the sea’s warming effect. Light dustings may settle a few times a winter, but heavy snow is rare. Higher ground inland, such as Snowdonia, sees much more.
How windy does it get in Porthmadog?
South-westerly gales can gust over 40 mph during autumn and winter, especially when Atlantic storms track close to the coast. The estuary and harbour can become choppy, so check the live forecast above before heading out.