Arnside Knott Weather Forecast – 159m, Lake District

Sunday 20 September 2026Confidence: High

Overall hill weather75/100Good

Wind10-25 mph westerly Gusts25-35 mph Feels like8 to 12°C PrecipitationLittle or none Cloud-free summit estimate95% Freezing levelAbove summit DaylightSunrise 06:52 · Sunset 19:16 · 12.4 hours daylight

The day on the hill

On Arnside Knott: summit wind broadly 10-25 mph, with gusts 25-35 mph at times (a fresh breeze).

Cloud & views

Cloud base around 800–1100 m in the morning, lifting to 1000–1300 m around midday and 1100–1400 m by late afternoon. The summit is likely to stay mostly clear.

Rain & temperature

Little or no rain is forecast.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 10.3 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: 2.7 h
Midday: 4 h
Later: 2 h

Morning · 08:00–12:00 Mixed Summit winds around 15-25 mph. Gusts around 25-35 mph are possible on exposed ground.

68/100

Afternoon · 12:00–17:00 Good Summit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground.

82/100

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

Daytime · exposed rockClimbing & scramblingBetaRock may be damp or still drying. Gusts near 30 mph may affect balance on exposed rock. Mixed65/100 View detailsHide details

Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look fair (65/100). Recent rain may leave seepage and damp rock, especially on shaded sections. The mapped summit rock is Limestone (Park Limestone Formation). Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger. Gusts may reach about 30 mph. Crosswinds can make exposed ridges substantially more serious.

Rock surfaceDry overhead; seepage uncertainPeak gust31 mphRain0.0 mm

Main factorsgusts around 30 mphdamp or incompletely dried rock possible

Mapped rock across the summit and available routes Limestone Park Limestone Formation

Origin: Sedimentary
Rock family: Limestone
Mapping: BGS Geology 50K · 1:50,000
Rock-response profile: Moderate confidence

View the summit BGS record

Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger. Summit-point mapping plus representative BGS bedrock samples along available GPX routes. These are not continuous geological surveys; contacts, superficial deposits and the exposed rock on individual holds may differ.

Rock groups along the sampled routes

These are mapped rock groups, not separate weather forecasts or a ranking of route safety.

Popular Arnside Knott

limestone

Geological detail and BGS records

Mapped variation

2 rock types appear across the available route samples

The summit type remains the forecast's cautious rock-response reference. Other mapped types show where conditions may behave differently elsewhere on the mountain.

Summit mapping Limestone Park Limestone Formation Around 110 m Seen on Popular Arnside Knott

Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

BGS record

Route sample Limestone Dalton Formation Around 29 m Seen on Popular Arnside Knott

Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

BGS record

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 darkBetaClearer spells are possible, but other forecasts keep much of the sky obscured by cloud. View forecastClose forecast

After dark: aurora and stargazing

Night beginning 2026-09-20. All times are UK local time.

Stargazing

Mixed sky conditions during the best available spell: 21 Sep, 02:00 BST to 03:00 BST.

Clearer spells are possible, but other forecasts keep much of the sky obscured by cloud.

Moon-free dark sky: 20 Sep, 23:55 BST to 21 Sep, 04:50 BST.

Sky conditions through the night

Fully dark periods. Conditions can change between forecast hours.
Time	Viewing conditions
20 Sep, 21:20 BST to 22:00 BST	Mixed sky conditions Clearer spells are possible, but other forecasts keep much of the sky obscured by cloud. Forecast models disagree.
20 Sep, 22:00 BST to 23:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky.
20 Sep, 23:00 BST to 21 Sep, 00:00 BST	Poor sky conditions Clearer spells are possible, but other forecasts keep much of the sky obscured by cloud. Forecast models disagree.
21 Sep, 00:00 BST to 01:00 BST	Poor sky conditions Clearer spells are possible, but other forecasts keep much of the sky obscured by cloud. Forecast models disagree.
21 Sep, 01:00 BST to 02:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky.
21 Sep, 02:00 BST to 03:00 BST	Mixed sky conditions Clearer spells are possible, but other forecasts keep much of the sky obscured by cloud. Forecast models disagree.
21 Sep, 03:00 BST to 04:00 BST	Mixed sky conditions Cloud is likely to obscure much of the sky.
21 Sep, 04:00 BST to 04:50 BST	Poor sky conditions Cloud is likely to obscure much of the sky.

Moon, darkness and meteor showers

Gibbous moon, about 69% illuminated.

Moonrise around 20 Sep, 17:25 BST.

Moonset around 20 Sep, 23:55 BST.

Full darkness: 20 Sep, 21:20 BST to 21 Sep, 04:50 BST.

Moon times assume an open horizon. Hills can hide the Moon sooner. Moon-free does not mean cloud-free.

Southern Taurids are active on this night. Activity may be much lower away from the peak.

Draconids: peak around 9 October 2026.
Southern Taurids: peak around 10 October 2026.
Orionids: peak around 21 October 2026.
Northern Taurids: peak around 12 November 2026.
Leonids: peak around 18 November 2026.
Geminids: peak around 14 December 2026.
Ursids: peak around 22 December 2026.

Dates from the Royal Observatory Greenwich. Activity dates do not guarantee visible meteors. Look across a broad, dark sky, not only north.

Darkness of the surroundings

Estimated darkness rank 946 of 980 assessed peaks (1 is darkest), based on surrounding artificial light in 2021. This is not a measurement of tonight’s sky.

2021 artificial-light baseline, not measured sky brightness or a Bortle class. Changes to lighting, blue-rich LEDs, terrain screening, atmospheric scattering and cloud-reflected light are not resolved. Similar ranks are not meaningfully distinct. Darkness is not a recommendation to climb a summit at night.

VIIRS nighttime lights: Earth Observation Group, Payne Institute for Public Policy, Colorado School of Mines. Reprocessed by OpenGeoHub/OpenLandMap. Cropped and ranked by Mountain Weather.

Sky-weather grades exclude light pollution, terrain and thin haze. They are not mountain safety ratings. Check the mountain and camping forecast separately. Accessible lower viewpoints may be a better choice than summits.

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 Arnside Knott on Sunday 20 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

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Monday 21 September 2026Confidence: High

Overall hill weather84/100Good

Wind10-25 mph westerly Gusts20-30 mph Feels like8 to 12°C PrecipitationLittle or none Cloud-free summit estimate95% Freezing levelAbove summit DaylightSunrise 06:54 · Sunset 19:13 · 12.3 hours daylight

The day on the hill

Little rain and limited summit cloud on Arnside Knott: summit wind broadly 10-25 mph, with gusts 20-30 mph at times (a moderate breeze).

Cloud & views

Cloud base around 1100–1400 m in the morning, lowering to 600–900 m around midday. The summit is likely to stay mostly clear.

Cloud may hang lower on western slopes and lift somewhat on the eastern side, but local terrain can differ.

Rain & temperature

Little or no rain is forecast.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 2 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: 0 h
Later: 0 h

Morning · 08:00–12:00 Good Summit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground.

84/100

Afternoon · 12:00–17:00 Good Summit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground.

84/100

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

Daytime · exposed rockClimbing & scramblingBetaRock may be damp or still drying. Good72/100 View detailsHide details

Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look fair (72/100). Recent rain may leave seepage and damp rock, especially on shaded sections. The mapped summit rock is Limestone (Park Limestone Formation). Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

Rock surfaceDry overhead; seepage uncertainPeak gust25 mphRain0.1 mm

Main concerndamp or incompletely dried rock possible

Mapped rock across the summit and available routes Limestone Park Limestone Formation

Origin: Sedimentary
Rock family: Limestone
Mapping: BGS Geology 50K · 1:50,000
Rock-response profile: Moderate confidence

View the summit BGS record

Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger. Summit-point mapping plus representative BGS bedrock samples along available GPX routes. These are not continuous geological surveys; contacts, superficial deposits and the exposed rock on individual holds may differ.

Rock groups along the sampled routes

These are mapped rock groups, not separate weather forecasts or a ranking of route safety.

Popular Arnside Knott

limestone

Geological detail and BGS records

Mapped variation

2 rock types appear across the available route samples

The summit type remains the forecast's cautious rock-response reference. Other mapped types show where conditions may behave differently elsewhere on the mountain.

Summit mapping Limestone Park Limestone Formation Around 110 m Seen on Popular Arnside Knott

Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

BGS record

Route sample Limestone Dalton Formation Around 29 m Seen on Popular Arnside Knott

Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

BGS record

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 darkBetaCloud is likely to obscure much of the sky. Reduced visibility may obscure faint objects. View forecastClose forecast

After dark: aurora and stargazing

Night beginning 2026-09-21. All times are UK local time.

Stargazing

Poor sky conditions during the best available spell: 21 Sep, 22:00 BST to 23:00 BST.

Cloud is likely to obscure much of the sky. Reduced visibility may obscure faint objects.

Moon-free dark sky: 22 Sep, 01:10 BST to 04:55 BST.

Sky conditions through the night

Fully dark periods. Conditions can change between forecast hours.
Time	Viewing conditions
21 Sep, 21:15 BST to 22:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky. Moonlight washes out fainter stars.
21 Sep, 22:00 BST to 23:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky. Reduced visibility may obscure faint objects.
21 Sep, 23:00 BST to 22 Sep, 00:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky. Reduced visibility may obscure faint objects.
22 Sep, 00:00 BST to 01:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky. Reduced visibility may obscure faint objects.
22 Sep, 01:00 BST to 02:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky. Reduced visibility may obscure faint objects.
22 Sep, 02:00 BST to 03:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky. Reduced visibility may obscure faint objects.
22 Sep, 03:00 BST to 04:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky. Reduced visibility may obscure faint objects.
22 Sep, 04:00 BST to 04:55 BST	Poor sky conditions Cloud is likely to obscure much of the sky. Reduced visibility may obscure faint objects.

Moon, darkness and meteor showers

Gibbous moon, about 78% illuminated.

Moonrise around 21 Sep, 17:45 BST.

Moonset around 22 Sep, 01:10 BST.

Full darkness: 21 Sep, 21:15 BST to 22 Sep, 04:55 BST.

Moon times assume an open horizon. Hills can hide the Moon sooner. Moon-free does not mean cloud-free.

Southern Taurids are active on this night. Activity may be much lower away from the peak.

Draconids: peak around 9 October 2026.
Southern Taurids: peak around 10 October 2026.
Orionids: peak around 21 October 2026.
Northern Taurids: peak around 12 November 2026.
Leonids: peak around 18 November 2026.
Geminids: peak around 14 December 2026.
Ursids: peak around 22 December 2026.