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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the MarketUK weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Based on the live forecast above, Snowdonia’s mountain weather is highly variable: summit temperatures typically run 5–8°C cooler than valley highs, with an above-average 60–70% chance of afternoon showers. Winds strengthen significantly above 600 metres, often gusting 30–40 mph.
What does the current pattern mean for hikers?
The live forecast shows a classic Atlantic front pushing moist air over Snowdonia. Expect low cloud to cling to ridges above 400m, reducing visibility to under 100 metres at times. Rain becomes persistent on western slopes (up to 8mm per hour), while eastern valleys like Dyffryn-Maentwrog stay drier. Ground conditions underfoot will be slippery above the treeline, especially on Craig y Rhaeadr and Tryfan approaches. The Bbc Wales Weather page updates hourly for localised shifts, and detailed 10-day guidance is available on 10 Day Weather Forecast UK.
How does elevation change the numbers?
Snowdonia’s topography creates sharp contrasts: Crib Goch’s exposed ridge can be 6°C colder than Llanberis village 900m below. Freezing levels this month hover around 700–900m, meaning snow patches may linger on north-facing gullies above 800m. Use the live forecast’s hill-summit layer (often shown as “Snowdon Summit” or “Pen-y-Pass”) and always subtract 1°C per 100m of ascent from the valley reading.
When is the best time to visit Snowdonia?
May–September offers the lowest chance of hill fog and the mildest daytime temperatures (12–18°C in valleys). However, the busiest months (July–August) bring more crowds and still a 45–50% chance of rain on Snowdon summit.
Is Snowdonia weather dangerous?
Yes, especially above 600 m. Sudden white-out, lightning on exposed ridges, and wind chill below freezing can occur year-round. Check the Met Office mountain forecast before going, and carry full waterproofs.
Can I get a 30-day outlook for Snowdonia?
Long-range forecasts for UK weather hub suggest a trend of unsettled westerlies in December with occasional drier spells. For daily detail, use snowdonia weather bbc updates or weather snowdonia 14 days from reliable sites. Snowdonia weather tomorrow and weather in snowdonia 10 days are usually accurate to within 2–3°C.
For broader comparisons, see Lake District Weather or Peak District Weather. Longer-range outlooks such as snowdonia weather forecast 21 days and snowdonia weather 30 days are best treated as trends, not precise data.