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Live forecasts update automatically; written guidance last reviewed 20 June 2026 by the BritainNow weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above before heading into Snowdonia, as conditions can shift rapidly from sunshine to thick cloud and rain within minutes. The national park’s mountainous terrain creates its own microclimate, meaning what you see at sea level often bears little relation to the weather on Glyder Fach or Snowdon itself.
What makes Snowdonia’s weather so changeable?
Snowdonia’s proximity to the Irish Sea, combined with its rugged peaks, forces moist Atlantic air upwards. As the air rises, it cools and condenses, bringing frequent cloud, drizzle and stronger winds at altitude. This orographic effect means even on a calm coastal day, the summits can be blustery and obscured. The live forecast above gives a picture for the whole region, but always check the specific mountain forecast for your route.
How do seasons affect the park?
Winter brings the most consistent snow cover above 600 metres, but also short daylight and bitter winds. Spring and autumn offer the best chance of settled weather, though rain is never far away. Summer sees the busiest trails, but cloud can still roll in at any hour. If you are planning a hike, always look at the forecast for the next 14 days—though beyond about a week, confidence drops sharply. For a broader view of conditions across the nation, see our UK weather hub.
Frequently asked questions
Is Snowdonia’s weather the same as the rest of north Wales?
No. The mountains create their own weather, meaning heavier rain, stronger winds and cooler temperatures than the nearby coast. The Snowdon summit can be 5–10°C colder than Llanberis village.
Can I rely on a 30-day forecast for Snowdonia?
Not accurately. Month-ahead forecasts for mountain areas are unreliable due to chaotic weather systems. The Met Office issues two-week outlooks, but the most useful planning comes from checking the forecast the day before and on the morning of your visit.
What should I wear for Snowdonia in December?
Waterproof layers, insulated jacket, hat, gloves and sturdy boots are essential. Ice and snow are common above 600 m, so crampons and an ice axe may be needed for high routes. Always check the weather before setting off.
For more regional forecasts, compare conditions with Peak District weather or the Lake District. And if you are planning a longer trip, our 10-day UK forecast can help you decide the best window to climb.