Clwydian Range and Berwyns mountain weather forecast.

The Berwyns and northeast Wales. Height-aware guidance for wind, cloud, rain and temperature.

Mountain Weather brief

Clwydian Range and Berwyns

Wednesday 21 October 2026 · The Berwyns and northeast Wales

Confidence: Unavailable Why?

A comparable model-confidence estimate is not available for this forecast.

What matters most

A poor day on the tops in the Clwydian Range and the Berwyns, with a blustery wind and drizzle for much of the day.

High-ground wind · 600 m25-35 mph southerly Gusts · 600 m35-45 mph Cloud base500-800 m Feels like · 600 m-4 to 0°C
Regional median

Sunshine and sky

More sunshine later. Sunshine is indicated more often later in the day.

Modelled sunshine5 h45% of daylight
Early0 h sunshine
Midday2 h sunshine
Later2 h sunshine

These are direct modelled sunshine hours during daylight, not the probability of sunshine. Cloud cover and summit cloud are assessed separately in the forecast above. The regional median prevents one unusually bright or dull summit cell defining the whole area.

Overnight forecast: 17:00–08:00 (UK local time), in Wild camping below.

Morning · 08:00–12:00MixedSummit winds around 20-35 mph. Gusts around 40-50 mph are possible on exposed ground. Gusts this strong can make walking into it hard work, with buffeting on ridges and edges. Summit cloud becomes more persistent later. Rain is forecast on some hills during this period.
56
Afternoon · 12:00–17:00PoorSummit winds around 25-35 mph. Gusts around 40-50 mph are possible on exposed ground. Gusts this strong can knock you off balance, so take care near edges and on narrow ridges. Rain is forecast on some hills during this period. Cloud may restrict summit views around midday and later.
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Conservative regional grades across representative summits, so one sheltered hill does not overstate the wider area.

01

High-ground wind (600 m)

At around 600 m, expect a southerly wind of 25–35 mph, gusting 35–45 mph. Gusts like that are strong enough to make walking into it hard work, with buffeting on ridges and edges.

02

Walking impact

Gusts of 35–45 mph are strong enough to make walking into it hard work, with buffeting on ridges and edges.

03

Rain and showers

Drizzle for much of the day. Expect 2–5 mm in total. Visibility may drop briefly in showers in parts of the area.

04

Cloud-free summits

Clear-summit estimate: about 75% early, about 25% around midday and about 30% later.

05

Cloud and visibility

The tops start clear, but the cloud comes down onto them mid-morning. The cloud base could be as low as 400–700 m in the early afternoon. In cloud you'll be finding your way without landmarks, so carry navigation you trust and know how to use, with a backup such as a spare battery or a map and compass.

06

Temperature and wind chill

At around 600 m it will be 4 to 8°C, feeling like -4 to 0°C in the wind. Take a hat, gloves, a windproof and a spare warm layer. Pack waterproofs too, and keep a warm layer dry in your pack.

07

Freezing level

The freezing level is above the summits.

08

Daylight

Sunrise 07:50, Sunset 18:06, about 10.3 hours daylight.

Overnight · 17:00–08:00Wild campingBetaToo windy for an exposed pitch around 900 m on some hills (gusts of about 35 mph and about 4 mm of rain). Lower down, a mixed night to camp, mainly because of the wind. 39Poor · 600 m View detailsHide details
Regional night beginning Wednesday 21 October 2026

Full regional overnight outlook

Too windy for an exposed pitch around 900 m on some hills. Lower down, a mixed night to camp, mainly because of the wind. Gusts reach about 35 mph on open ground, which makes for a noisy, testing night even in a good tent. Check the forecast for the hill and height you have in mind, and don't assume lower ground will be sheltered. About 4 mm of rain is forecast overnight. Up around 600 m you'd likely be in cloud for part of the night: damp, and hard to find your way if you need to move. Overnight lows of about 6°C at 300 m.

Overnight rain4.3 mmOpen ground · 600 m18 mph · gusts 37 mphMorning pack-upDampness possible

Moon overnight

Waxing gibbous moon

Illuminated disc
80%
Moonrise
Outside this window
Moonset
03:02 next morning BST

Cloud and terrain vary across the area. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 21 Oct, 17:00 BST to 22 Oct, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Representative location: 52.917, -3.746. Times vary across the area.

300 m57 · mixed
Wind / gust
15 mph / 31 mph
Coldest
5.8°C
In cloud
0% of modelled night
Condensation
High
600 m39 · poor
Wind / gust
18 mph / 37 mph
Coldest
5.8°C
In cloud
33% of modelled night
Condensation
High

Open-hillside guidance across representative hills. Local shelter, ridges, tent design and the exact pitch can change conditions substantially. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 45 mph may affect balance on exposed rock. 0Poor · Very poor View detailsHide details
Regional rock conditions · sampled mountain terrain

Regional climbing & scrambling outlook

A broad guide to dampness and exposed rock across the area, not a forecast for every crag. Lower, sheltered crags and individual rock types may behave differently.

Conditions for exposed scrambling across the area look very poor (0/100). Rain is likely to leave rock wet. Polished slabs, vegetation and drainage lines may be notably worse. Gusts may reach about 45 mph on exposed ground, making crosswinds an important route consideration. Mapped summit-point geology across the representative hills includes slate or mudstone and volcanic rock. Rock can therefore respond differently to moisture between crags and routes.

Rock surfaceWet rock likelyExposed gust46 mphRain3.6 mm
Mapped rock across sampled summits2 broad familiesSummit samples, not a survey of every crag
slate or mudstone 62% 5 representative summitsOften positive when dry, but smooth, polished or slabby sections can become markedly more slippery when damp.volcanic rock 38% 3 representative summitsOften grippy when dry, but volcanic rocks vary widely; wet lichen, smooth holds and local seepage can still make them slippery.

Representative summit-point samples across the region; individual crags and routes may differ.

Generic exposed hands-on-rock terrain across representative summits; mapped summit-point geology is a broad regional sample, not a named-route survey. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Recommended kit for this dayWeather-aware packing prompts, plus your core hillwalking kitView kit

For a day hillwalk, not a complete route-specific checklist. Carry navigation and backup you can use, warm and waterproof layers, suitable footwear, food and water, a headtorch, emergency shelter, first aid and a way to call for help. Snow, ice, technical terrain and overnight trips need additional equipment and skills.

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Weather data: Open-Meteo (CC BY 4.0). Adapted by Mountain Weather.

Updated 15 October 2026 at 05:28 UTC. See typical weekly and monthly conditions for Clwydian Range and Berwyns.

More context for your hill day

Check the approach as well as the tops

Compare midge conditions by day and height, or look for a possible cloud inversion. For Snowdon and Tryfan, camera-derived cloud-base observations add a view of conditions already seen on the slopes.