Clwydian Range and Berwyns mountain weather forecast.

Wed 18 Nov on the hillsA mixed day in the Clwydian Range and the Berwyns, with many summits in cloud for most of the day. See wind, cloud base and timings

Mountain Weather brief

Clwydian Range and Berwyns

Wednesday 18 November 2026 · The Berwyns and northeast Wales

Confidence: Medium Why?

Uncertainty over rain amounts and timing. Uncertainty over high-ground wind strength. Uncertainty over sky cloud cover and sunshine.

What matters most

A mixed day in the Clwydian Range and the Berwyns, with many summits in cloud for most of the day.

High-ground wind · 600 m10-20 mph westerly Gusts · 600 m15-25 mph Cloud base400-700 m Feels like · 600 m-2 to 2°C
Regional median

Sunshine and sky

Less sunshine later. Sunshine is indicated less often later in the day.

Modelled sunshine3 h34% of daylight
Early1.2 h sunshine
Midday0.8 h sunshine
Later0 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 · 08:00–12:00PoorSummit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground. Cloud may restrict summit views early on. Some forecast models bring rain during the morning, while others keep it mostly dry.
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Afternoon · 12:00–17:00MixedSummit winds around 5-15 mph. Gusts around 15-25 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later. Rain is forecast on some hills during this period. Some forecast models bring rain during the afternoon, while others keep it mostly dry.
58

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 westerly wind of 10–20 mph, gusting 15–25 mph.

02

Walking impact

Noticeable on exposed ground, but unlikely to impede most walking.

03

Ground conditions

The ground is likely to be wet after recent rain.

04

Rain and showers

A little rain at times. Some forecast models bring rain during the morning and afternoon, while others keep it mostly dry.

05

Cloud-free summits

Clear-summit estimate: about 10% early, about 10% around midday and about 25% later.

06

Cloud and visibility

Expect many summits to be in cloud for most of the day. The cloud base could be as low as 200–500 m early in the morning. 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. Mist or fog is possible in some valleys early on. Any sunshine is more likely on lower ground than on the summits.

07

Temperature and wind chill

At around 600 m it will be 4 to 8°C, feeling like -2 to 2°C in the wind. Take a hat, gloves, a windproof and a spare warm layer.

08

Freezing level

The freezing level is above the summits.

09

Daylight

Sunrise 07:41, Sunset 16:15, about 8.6 hours daylight.

Overnight · 17:00–08:00Wild campingBetaNot a night to camp on the open hill anywhere in this area: gusts of about 40 mph and about 8 mm of rain. 19Poor · 600 m View detailsHide details
Regional night beginning Wednesday 18 November 2026

Full regional overnight outlook

Not a night to camp on the open hill anywhere in this area. Gusts reach about 40 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 8 mm of rain is forecast overnight. At every height we checked (300-600 m) you'd likely be in cloud for part of the night: damp, and hard to find your way if you need to move. A cold night, down to about 1°C around 600 m.

Overnight rain7.9 mmOpen ground · 600 m17 mph · gusts 42 mphMorning pack-upDampness possible

Moon overnight

Waxing gibbous moon

Illuminated disc
65%
Moonrise
Outside this window
Moonset
00:57 next morning GMT

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

Overnight window: 18 Nov, 17:00 GMT to 19 Nov, 08:00 GMT. 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 m39 · poor
Wind / gust
15 mph / 35 mph
Coldest
3.1°C
In cloud
33% of modelled night
Condensation
High
600 m19 · very poor
Wind / gust
17 mph / 42 mph
Coldest
1.4°C
In cloud
60% 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. 10Poor · 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 (10/100). Rain is likely to leave rock wet. Polished slabs, vegetation and drainage lines may be notably worse. 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 gust24 mphRain0.5 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 14 November 2026 at 16:37 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.