Eryri (Snowdonia) mountain weather forecast.

Tue 17 Nov on the hillsA poor day on the tops in Eryri (Snowdonia), with burns likely to be in spate and many summits in cloud for most of the day. See wind, cloud base and timings

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Each regional brief uses a high-ground level that suits the terrain, from 500 m on Dartmoor and in the Peak District to 900 m in the highest ranges.

Mountain Weather brief

Eryri (Snowdonia)

Tuesday 17 November 2026 · Yr Wyddfa, the Glyderau and the Carneddau

Confidence: Medium Why?

Uncertainty over rain amounts and timing. Uncertainty over sky cloud cover and sunshine.

What matters most

A poor day on the tops in Eryri (Snowdonia), with burns likely to be in spate and many summits in cloud for most of the day.

High-ground wind · 900 m20-30 mph westerly Gusts · 900 m25-35 mph Cloud base0-300 m Feels like · 900 m-6 to -2°C

Regional median

Sunshine and sky

Sunshine through the day. The time blocks show where the model places the brighter spells.

Modelled sunshine2.1 h24% of daylight

EarlyLess than 1 hour sunshine

Midday1.2 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 15-25 mph. Gusts around 25-35 mph are possible on exposed ground. Rain is forecast on some hills during this period. Cloud may restrict summit views early on. Rain is possible during the morning, but forecast models disagree on whether it will fall.

Afternoon · 12:00–17:00PoorSummit winds around 15-25 mph. Gusts around 25-35 mph are possible on exposed ground. Rain is forecast on some hills during this period. Cloud may restrict summit views around midday and later. Some forecast models bring rain during the afternoon, while others keep it mostly dry.

Conservative regional grades across representative summits, so one sheltered hill does not overstate the wider area.

High-ground wind (900 m)

At around 900 m, expect a westerly wind of 20–30 mph, gusting 25–35 mph. Gusts like that will be noticeable on ridges and open tops, and you will chill quickly when you stop.

Walking impact

Gusts of 25–35 mph will be noticeable on ridges and open tops, and you will chill quickly when you stop.

Ground conditions

The ground is likely to be wet after recent rain.

Spate risk

High spate risk based on recent and forecast rainfall. Burns and unbridged crossings may become difficult or impassable. Timing and severity can vary between catchments. Check the peak forecast for the separate rain/runoff periods. Turn back if a crossing looks unsafe.

Rain and showers

Spells of drizzle through the day. Rain is possible during the morning, but forecast models disagree on whether it will fall. Some forecast models bring rain during the afternoon, while others keep it mostly dry. Visibility may drop briefly in showers in parts of the area.

Cloud-free summits

Clear-summit estimate: about 20% early, about 20% around midday and about 15% later.

Cloud and visibility

Expect many summits to be in cloud for most of the day. The cloud base could be as low as 100–400 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.

Temperature and wind chill

At around 900 m it will be 2 to 6°C, feeling like -6 to -2°C in the wind. Take a hat, gloves, a windproof and a spare warm layer.

Freezing level

The freezing level is above the summits.

Daylight

Sunrise 07:43, Sunset 16:18, about 8.6 hours daylight.

Overnight · 17:00–08:00Wild campingBetaAcross these hills, a mixed night to camp, mainly because of the wind: about 3 mm of rain. 54Mixed · 600 m View detailsHide details

Regional night beginning Tuesday 17 November 2026

Full regional overnight outlook

Across these hills, a mixed night to camp, mainly because of the wind. Gusts reach about 30 mph on open ground, so peg out well and use the guylines. Look for shelter from the west. About 3 mm of rain is forecast overnight. At every height we checked (300-900 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 2°C around 900 m.

Overnight rain3.0 mmOpen ground · 600 m15 mph · gusts 27 mphMorning pack-upDampness possible

Moon overnight

Waxing gibbous moon

Illuminated disc: 55%
Moonrise: Outside this window
Moonset: 23:42 GMT

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

Overnight window: 17 Nov, 17:00 GMT to 18 Nov, 08:00 GMT. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Representative location: 53.069, -4.076. Times vary across the area.

Elevation reference (open ground)

300 m54 · mixed

Wind / gust: 12 mph / 22 mph
Coldest: 6.9°C
In cloud: 60% of modelled night
Condensation: High

600 m54 · mixed

Wind / gust: 15 mph / 27 mph
Coldest: 5.0°C
In cloud: 60% of modelled night
Condensation: High

900 m47 · mixed

Wind / gust: 17 mph / 31 mph
Coldest: 1.7°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 & scramblingBetaSnow is likely to be lying on some high ground. Scrambling may require winter mountaineering skills and equipment. Wet rock is likely. Gusts near 30 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 30 mph on exposed ground, making crosswinds an important route consideration. Mapped summit-point geology across the representative hills includes volcanic rock and slate or mudstone. Rock can therefore respond differently to moisture between crags and routes.

Rock surfaceWet rock likelyExposed gust31 mphRain0.8 mm

Mapped rock across sampled summits2 broad familiesSummit samples, not a survey of every crag

volcanic rock 88% 7 representative summitsOften grippy when dry, but volcanic rocks vary widely; wet lichen, smooth holds and local seepage can still make them slippery.slate or mudstone 12% 1 representative summitOften positive when dry, but smooth, polished or slabby sections can become markedly more slippery when damp.

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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Help the Mountain Decisions Project understand how forecasts influence hill days, including when plans stay the same. Findings will be shared publicly as summaries, not individual responses.

This is about Eryri (Snowdonia) on Tuesday 17 November 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

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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 Eryri (Snowdonia).

Winter conditions outlook

Snow on the hills from Monday

Eryri (Snowdonia): the 2 outlook areas covering its hills. All winter outlooks

Eryri (Snowdonia)Significant from MondayMon 16 Nov: Wind-drifted snow expected on north-west through north to north-east-facing slopes.

Mon 16 NovWind-drifted snow expected on north-west through north to north-east-facing slopes.

Snow lying above about 400 m. 5 to 10 cm of new snow on Monday. Loose, soft snow underfoot.

Read the full outlook Snow on the hills, Fresh snow, Where the wind will put the snow, Cornices, Underfoot, Frozen turf

Snow on the hills

Expect snow lying above about 400 m.

Fresh snow

5 to 10 cm of new snow is forecast on Monday. It will be deeper where the wind piles it into drifts. Rain or a thaw will make the snow wet and heavy, especially in the afternoon. A hard frost afterwards would freeze the surface solid again.

Where the wind will put the snow

Expect gale-force southerly winds, around 70 mph on the tops, to blow the snow about. It will pile into drifts on north-west through north to north-east-facing ground, especially below ridges, crags and corrie rims, and in gullies and hollows. Slopes facing into the wind will be scoured, with thinner snow and more rock and ice showing.

Cornices

Cornices are likely to grow above north-facing slopes because there will be plenty of new snow to move; a 70 mph wind is strong enough to carry loose snow; and that wind will blow across the ridges from the south. A cornice is an overhanging lip of snow built out over the drop by the wind. It can break well back from the edge, so keep well away from it, especially in poor visibility, and do not linger below one, particularly as it warms.

Underfoot

Expect new, loose snow on top, with hard going in deeper drifts. Conditions will change through the day: thawing 13:00-14:00 after a frozen night, refreezing by evening.

Frozen turf

Turf is not expected to be frozen, so frozen-turf scrambles and winter routes will not be in condition.

Avalanches

Wind-drifted snow on steep slopes is the most common cause of avalanches in British hills, and it can stay unstable for a day or two after the wind drops. Rain or a sharp thaw on lying snow makes wet snow slides more likely on steep slopes. See the note below for where to find an avalanche forecast.

Tue 17 NovWind-drifted snow expected on north-west through north to north-east-facing slopes.

Snow lying on the tops. 5 to 10 cm of new snow over the three days to Tuesday. Wet, heavy snow underfoot.

Read the full outlook Snow on the hills, Fresh snow, Where the wind will put the snow, Cornices, Underfoot, Frozen turf

Snow on the hills

Expect snow lying on the tops.

Fresh snow

5 to 10 cm of new snow is forecast over the three days to Tuesday. It will be deeper where the wind piles it into drifts. Rain or a thaw will make the snow wet and heavy, especially in the afternoon. A hard frost afterwards would freeze the surface solid again.

Where the wind will put the snow

Expect strong southerly winds, around 38 mph on the tops, to blow the snow about. It will pile into drifts on north-west through north to north-east-facing ground, especially below ridges, crags and corrie rims, and in gullies and hollows. Slopes facing into the wind will be scoured, with thinner snow and more rock and ice showing.

Cornices

Cornices are likely to grow above north-facing slopes because there will be plenty of new snow to move; a 38 mph wind is strong enough to carry loose snow; and that wind will blow across the ridges from the south. A cornice is an overhanging lip of snow built out over the drop by the wind. It can break well back from the edge, so keep well away from it, especially in poor visibility, and do not linger below one, particularly as it warms.

Underfoot

Expect wet, heavy snow. It balls up under crampons and can slide on steep ground. Conditions will change through the day: thawing from 03:00 onward.

Frozen turf

Turf is not expected to be frozen, so frozen-turf scrambles and winter routes will not be in condition.

Avalanches

Wed 18 NovLittle or no lying snow expected on the hills.

Little or no snow lying yet. 5 to 10 cm of new snow over the three days to Wednesday.

Read the full outlook Snow on the hills, Fresh snow, Frozen turf

Snow on the hills

Expect little or no lying snow. Old patches may survive in sheltered gullies.

Fresh snow

5 to 10 cm of new snow is forecast over the three days to Wednesday.

Frozen turf

Turf is not expected to be frozen, so frozen-turf scrambles and winter routes will not be in condition.

Cadair IdrisSignificant from MondayMon 16 Nov: Wind-drifted snow expected on north-west through north to north-east-facing slopes.

Mon 16 NovWind-drifted snow expected on north-west through north to north-east-facing slopes.

Snow lying above about 400 m. 5 to 10 cm of new snow on Monday. Loose, soft snow underfoot. More snow to come: a few centimetres on Tuesday.

Read the full outlook Snow on the hills, Fresh snow, Where the wind will put the snow, Cornices, Underfoot, Frozen turf, Snow to come

Snow on the hills

Expect snow lying above about 400 m. Drifts will be deepest on north-west and north-facing slopes, where soft snow may be knee-deep or more in hollows and gully tops.

Fresh snow

Where the wind will put the snow

Expect gale-force southerly winds, around 65 mph on the tops, to blow the snow about. It will pile into drifts on north-west through north to north-east-facing ground, especially below ridges, crags and corrie rims, and in gullies and hollows. Slopes facing into the wind will be scoured, with thinner snow and more rock and ice showing. Older drifts from earlier winds are also likely on west-facing slopes.

Cornices

Cornices are likely to grow above north-west and north-facing slopes because there will be plenty of new snow to move; a 65 mph wind is strong enough to carry loose snow; and that wind will blow across the ridges from the south. A cornice is an overhanging lip of snow built out over the drop by the wind. It can break well back from the edge, so keep well away from it, especially in poor visibility, and do not linger below one, particularly as it warms.

Underfoot

Expect new, loose snow on top, with hard going in deeper drifts. Conditions will change through the day: thawing 11:00-16:00 after a frozen night, refreezing by evening.

Frozen turf

Turf is not expected to be frozen, so frozen-turf scrambles and winter routes will not be in condition.

Snow to come

On Tuesday: a few centimetres of snow expected on the tops, drifting onto north-west through north to north-east-facing slopes.

Avalanches

Tue 17 NovWind-drifted snow expected on north-west through north to north-east-facing slopes.

Snow lying on the tops. A few centimetres of new snow on Tuesday. Wet, heavy snow underfoot.

Read the full outlook Snow on the hills, Fresh snow, Where the wind will put the snow, Cornices, Underfoot, Frozen turf

Snow on the hills

Expect snow lying on the tops. Drifts will be deepest on north-west and north-facing slopes, where soft snow may be knee-deep or more in hollows and gully tops.

Fresh snow

A few centimetres of new snow is forecast on Tuesday. It will be deeper where the wind piles it into drifts. Rain or a thaw will make the snow wet and heavy, especially in the afternoon. A hard frost afterwards would freeze the surface solid again.

Where the wind will put the snow

Expect strong southerly winds, around 39 mph on the tops, to blow the snow about. It will pile into drifts on north-west through north to north-east-facing ground, especially below ridges, crags and corrie rims, and in gullies and hollows. Slopes facing into the wind will be scoured, with thinner snow and more rock and ice showing.

Cornices

Cornices are likely to grow above north-west and north-facing slopes because there will be plenty of new snow to move; a 39 mph wind is strong enough to carry loose snow; and that wind will blow across the ridges from the south. A cornice is an overhanging lip of snow built out over the drop by the wind. It can break well back from the edge, so keep well away from it, especially in poor visibility, and do not linger below one, particularly as it warms.

Underfoot

Expect wet, heavy snow. It balls up under crampons and can slide on steep ground. Conditions will change through the day: thawing from 04:00 onward.

Frozen turf

Turf is not expected to be frozen, so frozen-turf scrambles and winter routes will not be in condition.

Avalanches

Wed 18 NovSome new snow expected on top of the existing cover.

Snow lying on the tops. 10 to 20 cm of new snow over the three days to Wednesday. Wet, heavy snow underfoot.

Read the full outlook Snow on the hills, Fresh snow, Underfoot, Frozen turf

Snow on the hills

Expect snow lying on the tops.

Fresh snow

10 to 20 cm of new snow is forecast over the three days to Wednesday. Rain or a thaw will make the snow wet and heavy, especially in the afternoon. A hard frost afterwards would freeze the surface solid again.

Underfoot

Expect wet, heavy snow. It balls up under crampons and can slide on steep ground. Conditions will change through the day: thawing right through, day and night.

Frozen turf

Turf is not expected to be frozen, so frozen-turf scrambles and winter routes will not be in condition.

Avalanches

Rain or a sharp thaw on lying snow makes wet snow slides more likely on steep slopes. See the note below for where to find an avalanche forecast.

Thu 19 NovA thin, patchy covering of snow expected on the tops.

A few centimetres of new snow over the three days to Thursday.

Read the full outlook Snow on the hills, Fresh snow, Frozen turf

Snow on the hills

Expect a thin, patchy covering on the tops, with small drifts in sheltered spots. Snow over grass and rock is slippery, and frozen patches can be icy.

Fresh snow

A few centimetres of new snow is forecast over the three days to Thursday. Rain or a thaw will make the snow wet and heavy, especially in the afternoon. A hard frost afterwards would freeze the surface solid again.

Frozen turf

Turf is not expected to be frozen, so frozen-turf scrambles and winter routes will not be in condition.

Avalanches

Rain or a sharp thaw on lying snow makes wet snow slides more likely on steep slopes. See the note below for where to find an avalanche forecast.

Written from a computer model of the weather and snow, not from reports on the hill. Conditions on the ground can differ, so look and judge for yourself.

Winter conditions outlook: Mountain Conditions by Spatial Terrain Ltd, used with permission. Issued 14 November 2026 at 14:00 UTC.

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.

Eryri (Snowdonia) midge forecast Cloud inversion forecast Snowdon and Tryfan cloud observations

Forecasts built around recognisable hill country.

Twenty distinct regions replace inherited service boundaries. Each uses a representative height suited to its terrain; named summits retain their exact height and exposure.

Eryri (Snowdonia) mountain weather forecast.

Eryri (Snowdonia)

High-ground wind (900 m)

Walking impact

Ground conditions

Spate risk

Rain and showers

Cloud-free summits

Cloud and visibility

Temperature and wind chill

Freezing level

Daylight

Full regional overnight outlook

Moon overnight

Elevation reference (open ground)

Regional climbing & scrambling outlook

Snow on the hills from Monday

Snow on the hills

Fresh snow

Where the wind will put the snow

Cornices

Underfoot

Frozen turf

Avalanches

Snow on the hills

Fresh snow

Where the wind will put the snow

Cornices

Underfoot

Frozen turf

Avalanches

Snow on the hills

Fresh snow

Frozen turf

Snow on the hills

Fresh snow

Where the wind will put the snow

Cornices

Underfoot

Frozen turf

Snow to come

Avalanches

Snow on the hills

Fresh snow

Where the wind will put the snow

Cornices

Underfoot

Frozen turf

Avalanches

Snow on the hills

Fresh snow

Underfoot

Frozen turf

Avalanches

Snow on the hills

Fresh snow

Frozen turf

Avalanches

Check the approach as well as the tops

Forecasts built around recognisable hill country.

Scotland

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England