Creigiau Gleision Weather Forecast – 678m, Eryri (Snowdonia)

Wednesday 23 September 2026Confidence: Medium

Overall hill weather22/100Poor

Wind15-30 mph northwesterly Gusts30-40 mph Feels like2 to 6°C PrecipitationAround 10-20 mm Cloud-free summit estimate65% Cloud base through day600-1,400 m Freezing levelAbove summit DaylightSunrise 07:02 · Sunset 19:12 · 12.2 hours daylight

The day on the hill

On Creigiau Gleision: summit wind broadly 15-30 mph, with gusts 30-40 mph at times (strong winds). Hill cloud may make navigation difficult, with very poor visibility in wetter spells.

Things to watch

Severe spate risk from the morning into the afternoon, with forecast rain and subsequent runoff. Timings are approximate, not a guarantee of safe crossings afterwards. Burns and unbridged crossings may become difficult or impassable. Turn back if a crossing looks unsafe.

Cloud & views

Cloud base around 600–900 m through the morning, lifting to 1100–1400 m by late afternoon. The top is likely to drift in and out of cloud, with the best chance of a view from late afternoon into the evening.

Cloud-height uncertainty could put the summit in or out of cloud. Clear spells may be difficult to time.

Cloud may hang lower on northwestern slopes and lift somewhat on the southeastern side, but local terrain can differ. Sunny spells are possible away from summit cloud, but may not reach the top while it is in cloud.

Showers are forecast. Some showers could be heavy.

The forecast total is around 10-20 mm, but local amounts will vary. Forecast models differ on summit wind strength: around 24-29 mph at walker height, with gusts 33-41 mph.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. Exposed tops may feel chilly in the wind.

A windproof layer will help, with an extra warm layer for stops. If clothing gets wet, you can cool more quickly.

Keep a dry warm layer protected. Buffeting may affect balance on exposed ground, particularly near ridges and edges.

Rain is forecast during the morning, but models differ considerably on the amount.

Cloud-free timing: Around 40% early, improving to around 95% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 3.4 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Early: 0 h
Midday: Less than 1 hour
Later: 1.9 h

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

Morning · 08:00–12:00 Poor Summit winds around 10-30 mph. Gusts around 30-40 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges. Rain is forecast during this period. Rain is forecast during the morning, but models differ considerably on the amount.

14/100

Afternoon · 12:00–17:00 Poor Rain eases compared with the morning. Summit winds around 15-25 mph. Gusts around 30-40 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later.

30/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaConditions look very good, but forecast uncertainty caps the grade at 92/100. 92/100Excellent · 600 m View detailsHide details

Night beginning Wednesday 23 September 2026

Full overnight outlook

Open-hillside camping looks very good overall around 600 m (92/100). It may be breezy on open ground, with gusts near 20 mph. Little overnight rain is forecast. The forecast does not have sufficiently broad dry and light-wind support for an exceptional grade. The grade is capped at 92/100.

Overnight rain0.0 mm Open ground · 600 m9 mph · gusts 20 mph Morning pack-upNo wet signal Sleeping-bag warmthISO comfort rating about 6°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc: 92%
Moonrise: 18:10 BST
Moonset: 04:07 next morning BST

Views of the Moon may come and go through cloud breaks. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 23 Sep, 17:00 BST to 24 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m92/100 · very good

Wind / gust: 8 mph / 17 mph
Typical / low: 8.3°C / 8.0°C · much of the night
In cloud: 0% of modelled night
Condensation: Low

600 m92/100 · very good

Wind / gust: 9 mph / 20 mph
Typical / low: 8.3°C / 8.0°C · much of the night
In cloud: 0% of modelled night
Condensation: Low

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 6°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 35 mph may affect balance on exposed rock. Poor0/100 View detailsHide details

Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (0/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Microgabbro (Unnamed Igneous Intrusion, Ordovician). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Gusts may reach about 35 mph. Crosswinds can make exposed ridges substantially more serious. Cloud may also make route-finding and retreat harder.

Rock surfaceWet rock likelyPeak gust37 mphRain19.6 mm

Main factorsgusts around 35 mphwet rock likelymuch of the route may be in cloud

Mapped summit rock Microgabbro Unnamed Igneous Intrusion, Ordovician

Origin: Igneous
Rock family: Granite, gneiss or gabbro
Mapping: BGS Geology 50K · 1:50,000
Rock-response profile: Moderate confidence

View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

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.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

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 Creigiau Gleision on Wednesday 23 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

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Thursday 24 September 2026Confidence: High

Overall hill weather82/100Good

Wind10-35 mph southwesterly Gusts35-45 mph Feels like4 to 8°C PrecipitationLittle or none Cloud-free summit estimate90% Cloud base through day1,500-1,800 m Freezing levelAbove summit DaylightSunrise 07:04 · Sunset 19:10 · 12.1 hours daylight

The day on the hill

On Creigiau Gleision: summit wind broadly 10-35 mph, with gusts 35-45 mph at times (strong winds).

Wind & exposure

Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops.

Rain & temperature

The ground is likely to be saturated after recent rain. Expect boggy paths and rapid runoff if more rain arrives.

Little or no rain is forecast. Forecast models differ on summit wind strength: around 24-34 mph at walker height, with gusts 33-47 mph.

Buffeting may affect balance on exposed ground, particularly near ridges and edges.

Cloud-free timing: Around 95% early, falling to around 70% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 9.3 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Early: 1.2 h
Midday: 4 h
Later: 2.2 h

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

Morning · 08:00–12:00 Excellent Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground.

90/100

Afternoon · 12:00–17:00 Good Winds strengthen compared with the morning. Summit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground.

75/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaGusts near 35 mph make meaningful shelter important. 39/100Poor · 600 m View detailsHide details

Night beginning Thursday 24 September 2026

Full overnight outlook

Open-hillside camping looks poor overall around 600 m (39/100). A lower pitch near 300 m looks more comfortable. Conditions are less suitable by 600 m. Open-ground gusts may reach about 35 mph. Seek meaningful shelter. Peak gusts range from about 30 mph at 300 m to 35 mph at 600 m. Around 4.6 mm is forecast, including rain around pack-up. Pitches near 600 m may spend part of the night in cloud, bringing damp conditions and poor visibility while cloud is present. Condensation risk is high near 600 m. Ventilation will matter.

Overnight rain4.6 mm Open ground · 600 m17 mph · gusts 37 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 6°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc: 97%
Moonrise: 18:21 BST
Moonset: 05:27 next morning BST

Cloud at the reference camping height may hide the Moon. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 24 Sep, 17:00 BST to 25 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m59/100 · mixed

Wind / gust: 14 mph / 30 mph
Typical / low: 12.2°C / 9.0°C · a brief spell
In cloud: 0% of modelled night
Condensation: Moderate

600 m39/100 · poor

Wind / gust: 17 mph / 37 mph
Typical / low: 12.0°C / 8.9°C · a brief spell
In cloud: 93% of modelled night
Condensation: High

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 6°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

The ground is likely to be very wet after recent rain. Expect boggy approaches and choose a durable pitch carefully.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Daytime · exposed rockClimbing & scramblingBetaRock may be damp or still drying. Gusts near 40 mph may affect balance on exposed rock. Poor39/100 View detailsHide details

Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look poor (39/100). Recent rain may leave seepage and damp rock, especially on shaded sections. The mapped summit rock is Microgabbro (Unnamed Igneous Intrusion, Ordovician). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Gusts may reach about 40 mph. Crosswinds can make exposed ridges substantially more serious.

Rock surfaceDry overhead; seepage uncertainPeak gust41 mphRain0.0 mm

Main factorsgusts around 40 mphdamp or incompletely dried rock possible

Mapped summit rock Microgabbro Unnamed Igneous Intrusion, Ordovician

Origin: Igneous
Rock family: Granite, gneiss or gabbro
Mapping: BGS Geology 50K · 1:50,000
Rock-response profile: Moderate confidence

View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

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.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

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 Creigiau Gleision on Thursday 24 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Friday 25 September 2026Confidence: Medium

Overall hill weather66/100Mixed

Wind10-25 mph westerly Gusts15-25 mph Feels like2 to 6°C PrecipitationAround 2-5 mm Cloud-free summit estimate80% Cloud base through day500-2,200 m Freezing levelAbove summit DaylightSunrise 07:05 · Sunset 19:07 · 12.0 hours daylight

The day on the hill

On Creigiau Gleision: summit wind broadly 10-25 mph, with gusts 15-25 mph at times (a moderate breeze).

Wind & exposure

Much calmer lower down - generally 0-10 mph in the valley, rising towards the tops.

Cloud & views

Cloud base around 500–800 m in the morning, then around 1900–2200 m around midday and 1300–1600 m by late afternoon. Summit cloud is extensive early, becoming less frequent later.

Cloud-height uncertainty could put the summit in or out of cloud. Clear spells may be difficult to time.

Very little direct sunshine is likely, with extensive cloud. Drizzle is forecast for much of the day.

The forecast total is around 2-5 mm, but local amounts will vary. Forecast models differ on summit wind strength: around 14-27 mph at walker height, with gusts 17-33 mph.

Rain & temperature

The ground is likely to be wet after recent rain.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. Exposed tops may feel chilly in the wind.

A windproof layer will help, with an extra warm layer for stops. If clothing gets wet, you can cool more quickly.

Keep a dry warm layer protected. Forecast models differ on whether meaningful rain reaches the hills during the afternoon and evening.

Cloud-free timing: Cloudy early, clearing later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 0 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Early: 0 h
Midday: 0 h
Later: 0 h

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

Morning · 08:00–12:00 Mixed Summit winds around 5-15 mph. Gusts around 15-25 mph are possible on exposed ground. Rain is forecast during this period. Some forecast models bring rain during the morning, while others keep it mostly dry.

53/100

Afternoon · 12:00–17:00 Good Rain eases compared with the morning. Summit winds around 10-20 mph. Gusts around 15-25 mph are possible on exposed ground. Rain is forecast during this period. Rain is possible during the afternoon, but forecast models disagree on whether it will fall.

79/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaGusts near 30 mph make meaningful shelter important. 59/100Mixed · 600 m View detailsHide details

Night beginning Friday 25 September 2026

Full overnight outlook

Open-hillside camping looks mixed overall around 600 m (59/100). A lower pitch near 300 m looks more comfortable. Conditions are less suitable by 600 m. Open-ground gusts may reach about 30 mph. Seek meaningful shelter. Peak gusts range from about 25 mph at 300 m to 30 mph at 600 m. Little overnight rain is forecast.

Overnight rain0.0 mm Open ground · 600 m15 mph · gusts 30 mph Morning pack-upNo wet signal Sleeping-bag warmthISO comfort rating about 6°C or lower

Moon overnight

Near-full moon

Illuminated disc: 99%
Moonrise: 18:31 BST
Moonset: 06:47 next morning BST

Clear spells may allow a view of the Moon. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 25 Sep, 17:00 BST to 26 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m88/100 · very good

Wind / gust: 13 mph / 25 mph
Typical / low: 9.8°C / 8.8°C · much of the night
In cloud: 0% of modelled night
Condensation: Low

600 m59/100 · mixed

Wind / gust: 15 mph / 30 mph
Typical / low: 9.7°C / 8.7°C · much of the night
In cloud: 13% of modelled night
Condensation: Low

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 6°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Poor29/100 View detailsHide details

Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look poor (29/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Microgabbro (Unnamed Igneous Intrusion, Ordovician). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

Rock surfaceWet rock likelyPeak gust22 mphRain3.8 mm

Main concernwet rock likely

Mapped summit rock Microgabbro Unnamed Igneous Intrusion, Ordovician

Origin: Igneous
Rock family: Granite, gneiss or gabbro
Mapping: BGS Geology 50K · 1:50,000
Rock-response profile: Moderate confidence

View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

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.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

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 Creigiau Gleision on Friday 25 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Saturday 26 September 2026Confidence: Medium

Overall hill weather50/100Mixed

Wind20-35 mph southwesterly Gusts40-50 mph Feels like4 to 8°C PrecipitationUp to around 2 mm Cloud-free summit estimate85% Cloud base through day500-1,800 m Freezing levelAbove summit DaylightSunrise 07:07 · Sunset 19:05 · 12.0 hours daylight

The day on the hill

On Creigiau Gleision: summit wind broadly 20-35 mph, with gusts 40-50 mph at times (strong winds). Patchy mist is possible in sheltered valleys early on.

Wind & exposure

Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops. Summit wind strength is uncertain: around 17-49 mph at walker height, with gusts 24-69 mph.

Check again nearer the time.

Cloud & views

Cloud base around 500–800 m in the morning, lifting to 1500–1800 m around midday. Summit cloud is extensive early, becoming less frequent later.

Summit cloud is uncertain: local cloud may cover the top even where the wider area looks clearer. Sunny spells are possible away from summit cloud, but may not reach the top while it is in cloud.

Drizzle is forecast at times. The forecast total is up to around 2 mm, but local amounts will vary.

Rain & temperature

The ground is likely to be wet after recent rain.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. Buffeting may affect balance on exposed ground, particularly near ridges and edges.

Summit wind could be roughly 17-49 mph, which changes how difficult exposed walking may feel.

Cloud-free timing: Around 40% early, improving to around 95% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 11 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Early: 2 h
Midday: 4 h
Later: 3 h

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

Morning · 08:00–12:00 Poor Summit winds around 20-30 mph. Gusts around 35-45 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges. Summit cloud is more persistent early in this period, with better prospects later.

47/100

Afternoon · 12:00–17:00 Mixed Summit winds around 20-35 mph. Gusts around 40-50 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges. Rain is forecast during this period.

54/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaExposed camping is not recommended near 600 m: gusts may reach about 45 mph. Sustained winds may reach about 30 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. 19/100Poor · 600 m View detailsHide details

Night beginning Saturday 26 September 2026

Full overnight outlook

Exposed camping is not recommended near 600 m: gusts may reach about 45 mph. Sustained winds may reach about 30 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. Open-hillside camping looks very poor overall around 600 m (19/100). Peak gusts range from about 35 mph at 300 m to 45 mph at 600 m. Around 1.3 mm is forecast, including rain around pack-up. Pitches near 600 m may spend part of the night in cloud, bringing damp conditions and poor visibility while cloud is present.

Overnight rain1.3 mm Open ground · 600 m29 mph · gusts 44 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 8°C or lower

Moon overnight

Near-full moon

Illuminated disc: 100%
Moonrise: 18:41 BST
Moonset: Outside this window

Cloud at the reference camping height may hide the Moon. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 26 Sep, 17:00 BST to 27 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m39/100 · poor

Wind / gust: 24 mph / 37 mph
Typical / low: 11.6°C / 10.9°C
In cloud: 0% of modelled night
Condensation: Moderate

600 m19/100 · very poor

Wind / gust: 29 mph / 44 mph
Typical / low: 11.3°C / 10.5°C
In cloud: 53% of modelled night
Condensation: Moderate

Warmth planning: As a broad starting point, consider a 2-season bag with an ISO/EN comfort rating at or below about 8°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 45 mph may affect balance on exposed rock. Poor6/100 View detailsHide details

Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (6/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Microgabbro (Unnamed Igneous Intrusion, Ordovician). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Gusts may reach about 45 mph. Crosswinds can make exposed ridges substantially more serious.

Rock surfaceWet rock likelyPeak gust44 mphRain0.3 mm

Main factorsgusts around 45 mphwet rock likely

Mapped summit rock Microgabbro Unnamed Igneous Intrusion, Ordovician

Origin: Igneous
Rock family: Granite, gneiss or gabbro
Mapping: BGS Geology 50K · 1:50,000
Rock-response profile: Moderate confidence

View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

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.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

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 Creigiau Gleision on Saturday 26 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Sunday 27 September 2026Confidence: Medium

Overall hill weather0/100Severe hill conditions

Wind25-40 mph southwesterly Gusts45-55 mph Feels like4 to 8°C PrecipitationAround 5-10 mm Cloud-free summit estimate35% Cloud base through day500-800 m Freezing levelAbove summit DaylightSunrise 07:09 · Sunset 19:03 · 11.9 hours daylight

The day on the hill

Strong gusts and frequent summit cloud on Creigiau Gleision: summit wind broadly 25-40 mph, with gusts 45-55 mph at times (strong winds).

Things to watch

Thunderstorms are possible from the morning into the evening. Keep an escape route from exposed ridges and descend if thunder develops.

If a thunderstorm develops, sudden gusts and heavy rain can change conditions quickly. Visibility may drop briefly in showers.

Wind & exposure

Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops. Gusts may knock you off balance on exposed ground, even between spells of lighter wind.

Cloud & views

Cloud base mostly around 500–800 m through daylight. Summit cloud is likely, but brief clear spells remain possible if the cloud sits higher than expected.

Cloud-height uncertainty could put the summit in or out of cloud. Clear spells may be difficult to time.

Cloud may hang lower on southwestern slopes and lift somewhat on the northeastern side, but local terrain can differ. Any sunshine may be confined to lower ground or breaks away from the summit.

Drizzle is forecast for much of the day, with some passing showers too. The forecast total is around 5-10 mm, but local amounts will vary.

Forecast models differ on summit wind strength: around 25-45 mph at walker height, with gusts 35-62 mph.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. A low thunderstorm risk remains difficult to time precisely.

0 is the bottom of the scale. Use the hazard details to judge how severe conditions could be.

Cloud-free timing: Around 30% early, improving to around 45% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 10.9 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Cloud may obscure this summit even while the surrounding model grid indicates sunshine. The low cloud-free summit estimate is a reason to be cautious about expecting views.

Early: 2 h
Midday: 4 h
Later: 2.9 h

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

Morning · 08:00–12:00 Severe hill conditions Summit winds around 30-40 mph. Gusts around 45-55 mph are possible on exposed ground. Gusts may knock you off balance on exposed ground, even between spells of lighter wind. Rain is forecast during this period. Some forecast models bring rain during the morning, while others keep it mostly dry.

0/100

Afternoon · 12:00–17:00 Poor Summit winds around 30-40 mph in the early afternoon, easing to 20-30 mph later. Gusts around 45-55 mph are possible on exposed ground. Gusts may knock you off balance on exposed ground, even between spells of lighter wind. Rain is forecast during this period. Some forecast models bring rain during the afternoon, while others keep it mostly dry.

1/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaConditions look very good, but forecast uncertainty caps the grade at 82/100. 82/100Good · 600 m View detailsHide details

Night beginning Sunday 27 September 2026

Full overnight outlook

Open-hillside camping looks promising overall around 600 m (82/100). It may be breezy on open ground, with gusts near 25 mph. Little overnight rain is forecast. Forecast models are not closely enough agreed for an exceptional grade. The grade is capped at 82/100.

Overnight rain0.0 mm Open ground · 600 m11 mph · gusts 27 mph Morning pack-upNo wet signal Sleeping-bag warmthISO comfort rating about 6°C or lower

Moon overnight

Waning gibbous moon

Illuminated disc: 98%
Moonrise: 18:52 BST
Moonset: Outside this window

Views of the Moon may come and go through cloud breaks. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 27 Sep, 17:00 BST to 28 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m82/100 · promising

Wind / gust: 10 mph / 23 mph
Typical / low: 10.0°C / 9.5°C · several hours
In cloud: 0% of modelled night
Condensation: Low

600 m82/100 · promising

Wind / gust: 11 mph / 27 mph
Typical / low: 9.5°C / 9.1°C · much of the night
In cloud: 13% of modelled night
Condensation: Low

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 6°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 50 mph may affect balance on exposed rock. Low thunderstorm risk. Avoid exposed rock if storms develop. Poor0/100 View detailsHide details

Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (0/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Microgabbro (Unnamed Igneous Intrusion, Ordovician). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Gusts may reach about 50 mph. Crosswinds can make exposed ridges substantially more serious. Cloud may also make route-finding and retreat harder. Low thunderstorm risk, broadly from the morning into the evening. Avoid committing to exposed ground if storms develop.

Rock surfaceWet rock likelyPeak gust52 mphRain6.8 mm

Main factorslow thunderstorm risk on exposed groundgusts around 50 mphwet rock likely

Mapped summit rock Microgabbro Unnamed Igneous Intrusion, Ordovician

Origin: Igneous
Rock family: Granite, gneiss or gabbro
Mapping: BGS Geology 50K · 1:50,000
Rock-response profile: Moderate confidence

View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

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.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

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 Creigiau Gleision on Sunday 27 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Monday 28 September 2026Confidence: Unavailable

Overall hill weather96/100Excellent

Wind5-15 mph southerly Gusts10-20 mph Feels like4 to 8°C PrecipitationLittle or none Cloud-free summit estimate90% Freezing levelAbove summit DaylightSunrise 07:11 · Sunset 19:00 · 11.8 hours daylight

The day on the hill

Little rain and limited summit cloud on Creigiau Gleision: summit wind broadly 5-15 mph, with gusts 10-20 mph at times (light winds).

Cloud & views

Cloud base around 1200–1500 m in the morning, then around 1900–2200 m around midday and 1500–1800 m by late afternoon. The summit is likely to stay mostly clear.

Rain & temperature

Little or no rain is forecast. Forecast models disagree markedly on summit wind strength.

Check again nearer the time.

Forecast confidence

Overall confidence is unavailable: insufficient comparable wind, rain guidance.

Cloud-free timing: Around 95% early, falling to around 75% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 10.9 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Early: 2 h
Midday: 4 h
Later: 2.9 h

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

Morning · 08:00–12:00 Excellent Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground.

94/100

Afternoon · 12:00–17:00 Excellent Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground.

97/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaExposed camping is not recommended near 300 and 600 m: gusts may reach about 55 mph. Sustained winds may reach about 40 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. 9/100Poor · 600 m View detailsHide details

Night beginning Monday 28 September 2026

Full overnight outlook

Exposed camping is not recommended near 300 and 600 m: gusts may reach about 55 mph. Sustained winds may reach about 40 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. Open-hillside camping looks very poor overall around 600 m (9/100). Peak gusts range from about 45 mph at 300 m to 55 mph at 600 m. Around 1.8 mm is forecast, including rain around pack-up. A wet pack-up remains possible from dew or brief dampness toward dawn.

Overnight rain1.8 mm Open ground · 600 m21 mph · gusts 53 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 8°C or lower

Moon overnight

Waning gibbous moon

Illuminated disc: 94%
Moonrise: 19:06 BST
Moonset: Outside this window

Extensive cloud may limit moonlight. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 28 Sep, 17:00 BST to 29 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m19/100 · very poor

Wind / gust: 18 mph / 45 mph
Typical / low: 11.0°C / 10.2°C
In cloud: 0% of modelled night
Condensation: Low

600 m9/100 · very poor

Wind / gust: 21 mph / 53 mph
Typical / low: 10.6°C / 10.2°C
In cloud: 20% of modelled night
Condensation: Low

Warmth planning: As a broad starting point, consider a 2-season bag with an ISO/EN comfort rating at or below about 8°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Daytime · exposed rockClimbing & scramblingBetaRock may be damp or still drying. Good84/100 View detailsHide details

Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look good (84/100). Some rock may still be damp or drying, especially on polished slabs and vegetated sections. The mapped summit rock is Microgabbro (Unnamed Igneous Intrusion, Ordovician). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery.

Rock surfaceDamp or dryingPeak gust15 mphRain0.0 mm

Main concerndamp or incompletely dried rock possible

Mapped summit rock Microgabbro Unnamed Igneous Intrusion, Ordovician

Origin: Igneous
Rock family: Granite, gneiss or gabbro
Mapping: BGS Geology 50K · 1:50,000
Rock-response profile: Moderate confidence

View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

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.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

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 Creigiau Gleision on Monday 28 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Tuesday 29 September 2026Confidence: Unavailable

Overall hill weather35/100Poor

Wind35-50 mph southwesterly Gusts55-65 mph Feels like4 to 8°C PrecipitationAround 5-10 mm Cloud-free summit estimate95% Freezing levelAbove summit DaylightSunrise 07:12 · Sunset 18:58 · 11.8 hours daylight

The day on the hill

Strong gusts on Creigiau Gleision: summit wind broadly 35-50 mph, with gusts 55-65 mph at times (gale-force mean winds at times). Heavier showers may bring brief, stronger gusts and rapidly reduced visibility.

Wind & exposure

Much calmer lower down - generally 10-20 mph in the valley, rising towards the tops.

Cloud & views

Cloud base mostly around 1200–1500 m through daylight. The summit is likely to stay mostly clear.

Rain & temperature

Rain and drizzle are forecast for much of the day, with some passing showers too. The forecast total is around 5-10 mm, but local amounts will vary.

Forecast models disagree markedly on summit wind strength. Check again nearer the time.

Walking into the wind is likely to be arduous, with buffeting that can knock you off balance.

Forecast confidence

Overall confidence is unavailable: insufficient comparable wind, rain guidance.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 6.5 h of sunshine. This is not a forecast of time in sunshine on the summit. Use the cloud and views outlook above for the conditions on this mountain.

Early: 0 h
Midday: 2.6 h
Later: 2.9 h

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

Morning · 08:00–12:00 Poor Summit winds around 30-40 mph. Gusts around 50-60 mph are possible on exposed ground. Gusts may knock you off balance on exposed ground, even between spells of lighter wind. Rain is forecast during this period.

34/100

Afternoon · 12:00–17:00 Poor Summit winds around 35-45 mph. Gusts around 50-60 mph are possible on exposed ground. Gusts may knock you off balance on exposed ground, even between spells of lighter wind. Rain is forecast during this period.

36/100

Compare an early start with later conditions. The main forecast above covers the day in more detail.

Overnight · 17:00–08:00Wild campingBetaExposed camping is not recommended near 300 and 600 m: gusts may reach about 70 mph. Sustained winds may reach about 50 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. 0/100Poor · 600 m View detailsHide details

Night beginning Tuesday 29 September 2026

Full overnight outlook

Exposed camping is not recommended near 300 and 600 m: gusts may reach about 70 mph. Sustained winds may reach about 50 mph at times. Choose an alternative off the exposed hill. Do not rely on finding shelter after setting out. Open-hillside camping looks very poor overall around 600 m (0/100). Peak gusts range from about 55 mph at 300 m to 70 mph at 600 m. Roughly 19.8 mm is forecast overnight, with rain liable to affect both pitching and packing up. Some condensation is possible overnight.

Overnight rain19.8 mm Open ground · 600 m44 mph · gusts 69 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 6°C or lower

Moon overnight

Waning gibbous moon

Illuminated disc: 87%
Moonrise: 19:24 BST
Moonset: Outside this window

Extensive cloud may limit moonlight. Illumination describes the sunlit part of the Moon, not brightness at your pitch.

Overnight window: 29 Sep, 17:00 BST to 30 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m9/100 · very poor

Wind / gust: 37 mph / 57 mph
Typical / low: 10.8°C / 9.6°C · a brief spell
In cloud: 0% of modelled night
Condensation: Moderate

600 m0/100 · very poor

Wind / gust: 44 mph / 69 mph
Typical / low: 10.8°C / 9.6°C · a brief spell
In cloud: 0% of modelled night
Condensation: Moderate

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 6°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

Open-hillside reference. A sheltered pitch may be calmer; cols and ridges may be much windier. Tent design and the exact pitch still matter. Read about sleeping-bag comfort ratings, pitching in strong winds or using the wild-camping forecast.

Did this match your night?Share a quick observation to help improve this beta forecast.Give feedback

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 60 mph may affect balance on exposed rock. Poor0/100 View detailsHide details

Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (0/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Microgabbro (Unnamed Igneous Intrusion, Ordovician). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Gusts may reach about 60 mph. Crosswinds can make exposed ridges substantially more serious.

Rock surfaceWet rock likelyPeak gust60 mphRain9.6 mm

Main factorsgusts around 60 mphwet rock likely

Mapped summit rock Microgabbro Unnamed Igneous Intrusion, Ordovician

Origin: Igneous
Rock family: Granite, gneiss or gabbro
Mapping: BGS Geology 50K · 1:50,000
Rock-response profile: Moderate confidence

View the summit BGS record

Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Summit-point bedrock mapping; the actual route may cross different rock, superficial deposits, polish, lichen or seepage.

Generic exposed scrambling terrain; mapped summit-point bedrock is included where available, but route grade, exact rock, polish, drainage and escape options remain unresolved. Contains British Geological Survey materials © UKRI 2026. How to use the climbing and scrambling forecast.

Did this match your experience?Tell us about the rock surface and wind to help improve this beta forecast.Give feedback

Overnight · Aurora, stars & meteorsAfter darkBetaNight-sky guidance is unavailable for this night. View forecastClose forecast

After dark: aurora and stargazing

Night-sky guidance is unavailable for this night. This does not mean clear skies or no aurora.

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.

Does the weather shape your plans?Optional hill-user research. One answer helps; further questions are up to you.Take part

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 Creigiau Gleision on Tuesday 29 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

Open the questions to take part.

About the research and your privacy · Already been out? Share that experience instead

Creigiau Gleision weather forecast.

Choose your hill day.

The day on the hill

Things to watch

Cloud & views

Forecast confidence

Full overnight outlook

Moon overnight

Elevation reference (open ground)

Full climbing & scrambling outlook

After dark: aurora and stargazing

The day on the hill

Wind & exposure

Rain & temperature

Full overnight outlook

Moon overnight

Elevation reference (open ground)

Full climbing & scrambling outlook

After dark: aurora and stargazing

The day on the hill

Wind & exposure

Cloud & views

Rain & temperature

Forecast confidence

Full overnight outlook

Moon overnight

Elevation reference (open ground)

Full climbing & scrambling outlook

After dark: aurora and stargazing

The day on the hill

Wind & exposure

Cloud & views

Rain & temperature

Forecast confidence

Full overnight outlook

Moon overnight

Elevation reference (open ground)

Full climbing & scrambling outlook

After dark: aurora and stargazing

The day on the hill

Things to watch

Wind & exposure

Cloud & views

Forecast confidence

Full overnight outlook

Moon overnight

Elevation reference (open ground)

Full climbing & scrambling outlook

After dark: aurora and stargazing

The day on the hill

Cloud & views

Rain & temperature

Forecast confidence

Full overnight outlook

Moon overnight

Elevation reference (open ground)

Full climbing & scrambling outlook

After dark: aurora and stargazing

The day on the hill

Wind & exposure

Cloud & views

Rain & temperature

Forecast confidence

Full overnight outlook

Moon overnight

Elevation reference (open ground)

Full climbing & scrambling outlook

After dark: aurora and stargazing

Weather around Creigiau Gleision.

A forecast is part of the decision.