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Live forecasts update automatically; written guidance last reviewed 13 June 2026 by the Insight Britain weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
The live forecast above gives you the current conditions and hourly outlook for Snowdonia’s core area around Llanberis. Because the national park spans from coast to summit, use the widget as a baseline and expect cooler, wetter, and windier conditions as you gain elevation.
How should you read the live forecast above for Snowdonia?
The widget shows data for the central Snowdonia valley. For mountain hikes, subtract several degrees from the temperature shown and add 10–15 mph to the wind speed. Rain likelihood in the widget often understates the chance of hill fog and summit showers, so treat any mention of rain as a near-certainty above 600 metres.
What is Snowdonia’s typical climate through the seasons?
Snowdonia has a maritime climate, meaning mild winters, cool summers, and rain throughout the year. Winter daytime highs in the valleys hover around 5–8°C, while summits can stay below freezing. Summer brings valley highs of 17–20°C, though the peaks rarely exceed 12°C. Rainfall is heavy: the western slopes receive over 3,000 mm annually, while the eastern side is slightly drier. Wind is a constant feature, especially from autumn through early spring.
How does local geography affect the weather?
The park’s mountains force moist Atlantic air upward, creating orographic rainfall that makes the west much wetter than the east. Coastal areas such as Porthmadog and Caernarfon experience milder temperatures and stronger winds. Valleys like the Ogwen and Llanberis Pass funnel gusts, while sheltered spots near Conwy can feel noticeably calmer. Urban heat is negligible; the main effect is elevation.
When is the best time to visit and what should you pack?
Late spring (May to June) and early autumn (September) offer the best balance of longer daylight, fewer crowds, and relatively settled weather. Pack waterproof and windproof layers year-round, sturdy boots, and sun protection for the rare clear day. In winter, add insulated gloves, a hat, and crampons if you plan to go above the snow line.
Which nearby areas do readers also check?
Visitors often compare conditions in Anglesey for coastal breezes, Pwllheli for the Llŷn Peninsula, and Llandudno for the north Wales coast. Each offers a different microclimate, generally milder and drier than the mountain core.
What will the weather be in Snowdonia tomorrow?
Check the live forecast above for the most accurate 24-hour view. In general, expect a mix of cloud and showers, with brighter spells in the east. Mountain tops will be windier and cooler, so plan for changeable conditions regardless of the valley outlook.
What is the 10 to 14 day outlook for Snowdonia?
Long-range forecasts for Snowdonia are unreliable due to its complex terrain. The 10-day forecast gives a general trend, but confidence drops sharply after day five. Look for broad pressure patterns rather than precise timings.
Does it rain a lot in Snowdonia?
Yes, Snowdonia is one of the wettest parts of the UK. The western mountains receive more than 3,000 mm of rain a year, while the eastern valleys get around 1,500 mm. Rain falls on roughly 200 days annually, so always carry waterproofs.
Are there weather warnings for Snowdonia?
Yes, the Met Office issues warnings for wind, rain, and snow. Always check the UK weather warnings before heading into the mountains, especially in winter and during autumn storms.