Mountain Weather

Firle Beacon weather forecast.

217 m summit in Bannau Brycheiniog (Brecon Beacons). 8 forecast days covering wind, cloud, rain and temperature, updated 5 November 2026 at 16:25 UTC.

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Confidence: High
Overall hill weather90Excellent
Summit wind · 08:00-17:005-15 mph easterly Summit gusts · 08:00-17:0015-25 mph Feels like0 to 4°C PrecipitationLittle or none Cloud-free summit estimate90% Freezing levelAbove summit DaylightSunrise 06:57 · Sunset 16:28 · 9.5 hours daylight

The day on the hill

A fine day on Firle Beacon: dry, with light winds and clear tops for most of the day.

Wind

On the summit expect light winds of up to 15 mph, mainly easterly, with gusts of 15–25 mph at the windiest. Lower down on the open hillside the wind will be light, under 10 mph.

Cloud and visibility

The tops are likely to stay mostly clear of cloud, though brief patches cannot be ruled out. The air should be clear, so expect far-reaching views as long as the tops stay clear.

Rain and ground

It should stay dry.

Warmth and kit

On the tops it will be around 4 to 8°C, feeling like 0 to 4°C in the wind. The freezing level is above the summits. Take a warm layer and a hat for the top.

Daylight

Sunset is around 4:30pm, so allow time to get off the hill before dark, and carry a head torch.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 2.9 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
1.6 h
Midday
1.2 h
Later
0 h
Morning · 08:00–12:00 Excellent Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground.
90
Afternoon · 12:00–17:00 Excellent Summit winds around 5-15 mph. Gusts around 15-25 mph are possible on exposed ground.
90

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

Daytime · exposed rockClimbing & scramblingBetaExcellent conditions for exposed scrambling. Excellent95 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Excellent conditions for exposed scrambling. The rock should be mostly dry, though drainage lines and shaded holds may still be damp. The rock around the summit is mostly chalk, a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.

Rock surfaceProbably dryPeak gust15-25 mphRain0.0 mm
Representative rock around the summit Chalk Lewes Nodular Chalk Formation
Origin
Sedimentary
Broad rock-response group
Limestone
Mapping
BGS Geology 50K · 1:50,000
Summit area
Limestone in 100% of 17 BGS samples within 350 m
Rock-response profile
Moderate confidence
View the summit BGS record

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.

Geological detail and BGS records
Mapped variation

3 rock types appear in the mapped samples

Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.

Summit-area sample Chalk Lewes Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Holywell Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Seaford Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record

Generic exposed scrambling terrain; BGS summit-area bedrock samples are 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

A broad surface report is enough; you do not need to identify a particular route.

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.

Explore the dedicated aurora forecast, meteor shower forecast or dark-sky and astrophotography 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.

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 Firle Beacon on Thursday 5 November 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

Confidence: High
Overall hill weather90Excellent
Summit wind · 08:00-17:000-10 mph southeasterly Summit gusts · 08:00-17:005-15 mph Feels like2 to 6°C PrecipitationLittle or none Cloud-free summit estimate90% Freezing levelAbove summit DaylightSunrise 06:59 · Sunset 16:26 · 9.4 hours daylight

The day on the hill

A fine day on Firle Beacon: dry, with light winds and clear tops for most of the day.

Wind

On the summit expect light winds of up to 10 mph, mainly south-easterly, with gusts of 5–15 mph at the windiest.

Cloud and visibility

The tops are likely to stay mostly clear of cloud, though brief patches cannot be ruled out.

Rain and ground

It should stay dry.

Warmth and kit

On the tops it will be around 4 to 8°C, feeling like 2 to 6°C in the wind. It turns milder through the day. The freezing level is above the summits. Take a warm layer and a hat for the top.

Daylight

Sunset is around 4:25pm, so allow time to get off the hill before dark, and carry a head torch.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 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
1.8 h
Midday
0 h
Later
0 h
Morning · 08:00–12:00 Excellent Summit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground.
89
Afternoon · 12:00–17:00 Excellent Summit winds around 0-10 mph. Gusts around 0-10 mph are possible on exposed ground.
90

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

Daytime · exposed rockClimbing & scramblingBetaExcellent conditions for exposed scrambling. Excellent95 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Excellent conditions for exposed scrambling. The rock should be mostly dry, though drainage lines and shaded holds may still be damp. The rock around the summit is mostly chalk, a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.

Rock surfaceProbably dryPeak gust5-15 mphRain0.0 mm
Representative rock around the summit Chalk Lewes Nodular Chalk Formation
Origin
Sedimentary
Broad rock-response group
Limestone
Mapping
BGS Geology 50K · 1:50,000
Summit area
Limestone in 100% of 17 BGS samples within 350 m
Rock-response profile
Moderate confidence
View the summit BGS record

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.

Geological detail and BGS records
Mapped variation

3 rock types appear in the mapped samples

Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.

Summit-area sample Chalk Lewes Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Holywell Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Seaford Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record

Generic exposed scrambling terrain; BGS summit-area bedrock samples are 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

A broad surface report is enough; you do not need to identify a particular route.

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.

Explore the dedicated aurora forecast, meteor shower forecast or dark-sky and astrophotography 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.

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 Firle Beacon on Friday 6 November 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

Confidence: High
Overall hill weather77Good
Summit wind · 08:00-17:000-10 mph westerly Summit gusts · 08:00-17:005-15 mph Feels like2 to 6°C PrecipitationUp to around 2 mm Cloud-free summit estimate90% Cloud base through day200-900 m Freezing levelAbove summit DaylightSunrise 07:00 · Sunset 16:24 · 9.4 hours daylight

The day on the hill

A good day on Firle Beacon: light winds and clear tops for most of the day.

Wind

On the summit expect light winds of up to 10 mph, mainly westerly, with gusts of 5–15 mph at the windiest.

Cloud and visibility

The tops are likely to stay mostly clear of cloud, though brief patches cannot be ruled out.

Rain and ground

Rain arrives mid-afternoon.

Warmth and kit

On the tops it will be around 4 to 8°C, feeling like 2 to 6°C in the wind. It turns milder through the day. The freezing level is above the summits. Take a warm layer and a hat for the top. Pack waterproofs too, and keep a warm layer dry in your pack.

Daylight

Sunset is around 4:25pm, so allow time to get off the hill before dark, and carry a head torch.

Forecast confidence

It's still two days off, so check again nearer the time.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 5.4 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
4 h
Later
0 h
Morning · 08:00–12:00 Mixed Summit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later.
68
Afternoon · 12:00–17:00 Excellent Summit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground. Rain is forecast during this period.
86

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

Daytime · exposed rockClimbing & scramblingBetaMixed conditions for exposed scrambling: wet, slippery rock. Poor40 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Mixed conditions for exposed scrambling. The rock is likely to be wet and slippery through the day. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly chalk, a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.

Rock surfaceWet rock likelyPeak gust5-15 mphRain1.8 mm
Main concernwet rock likely
Representative rock around the summit Chalk Lewes Nodular Chalk Formation
Origin
Sedimentary
Broad rock-response group
Limestone
Mapping
BGS Geology 50K · 1:50,000
Summit area
Limestone in 100% of 17 BGS samples within 350 m
Rock-response profile
Moderate confidence
View the summit BGS record

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.

Geological detail and BGS records
Mapped variation

3 rock types appear in the mapped samples

Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.

Summit-area sample Chalk Lewes Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Holywell Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Seaford Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record

Generic exposed scrambling terrain; BGS summit-area bedrock samples are 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

A broad surface report is enough; you do not need to identify a particular route.

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.

Explore the dedicated aurora forecast, meteor shower forecast or dark-sky and astrophotography 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.

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 Firle Beacon on Saturday 7 November 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

Confidence: Medium
Overall hill weather84Good
Summit wind · 08:00-17:000-10 mph westerly Summit gusts · 08:00-17:005-15 mph Feels like0 to 4°C PrecipitationLittle or none Cloud-free summit estimate90% Cloud base through day200-700 m Freezing levelAbove summit DaylightSunrise 07:02 · Sunset 16:23 · 9.3 hours daylight

The day on the hill

A good day on Firle Beacon: dry, with light winds and clear tops for most of the day.

Wind

On the summit expect light winds of up to 10 mph, mainly westerly, with gusts of 5–15 mph at the windiest.

Cloud and visibility

The tops are likely to stay mostly clear of cloud, though brief patches cannot be ruled out.

Rain and ground

It should stay dry.

Warmth and kit

On the tops it will be around 4 to 8°C, feeling like 0 to 4°C in the wind. The freezing level is above the summits. Take a warm layer and a hat for the top.

Daylight

Sunset is around 4:25pm, so allow time to get off the hill before dark, and carry a head torch.

Forecast confidence

Cloud heights are particularly hard to pin down today. It's still three days off and could change, so check again nearer the time.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 7.5 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
1.5 h
Midday
4 h
Later
0 h
Morning · 08:00–12:00 Good Summit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later.
73
Afternoon · 12:00–17:00 Excellent Summit winds around 0-10 mph. Gusts around 0-10 mph are possible on exposed ground.
95

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

Daytime · exposed rockClimbing & scramblingBetaGood conditions for exposed scrambling. Good76 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Good conditions for exposed scrambling. The rock should be drying, but damp patches, shaded holds and drainage lines may still be wet. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly chalk, a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.

Rock surfaceDamp or dryingPeak gust5-15 mphRain0.0 mm
Main concerndamp or incompletely dried rock possible
Representative rock around the summit Chalk Lewes Nodular Chalk Formation
Origin
Sedimentary
Broad rock-response group
Limestone
Mapping
BGS Geology 50K · 1:50,000
Summit area
Limestone in 100% of 17 BGS samples within 350 m
Rock-response profile
Moderate confidence
View the summit BGS record

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.

Geological detail and BGS records
Mapped variation

3 rock types appear in the mapped samples

Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.

Summit-area sample Chalk Lewes Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Holywell Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Seaford Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record

Generic exposed scrambling terrain; BGS summit-area bedrock samples are 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

A broad surface report is enough; you do not need to identify a particular route.

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.

Explore the dedicated aurora forecast, meteor shower forecast or dark-sky and astrophotography 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.

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 Firle Beacon on Sunday 8 November 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

Confidence: Medium
Overall hill weather85Excellent
Summit wind · 08:00-17:0010-20 mph easterly Summit gusts · 08:00-17:0020-30 mph Feels like2 to 6°C PrecipitationLittle or none Cloud-free summit estimate90% Freezing levelAbove summit DaylightSunrise 07:04 · Sunset 16:21 · 9.3 hours daylight

The day on the hill

A fine day on Firle Beacon: dry, with light winds and clear tops for most of the day.

Wind

On the summit expect an easterly wind of 10–20 mph for most of the day, with gusts of 20–30 mph at the windiest. It gets windier still after dark, with summit gusts of 25–35 mph, so bear that in mind if you will be out late.

Cloud and visibility

The tops are likely to stay mostly clear of cloud, though brief patches cannot be ruled out.

Rain and ground

Mostly dry, but some forecast models bring rain later on.

Warmth and kit

On the tops it will be around 6 to 10°C, feeling like 2 to 6°C in the wind. The freezing level is above the summits. A windproof and an extra layer for stops will help.

Daylight

Sunset is around 4:20pm, so allow time to get off the hill before dark, and carry a head torch.

Forecast confidence

It's still four days off and could change, so check again nearer the time.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 7.8 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
1.8 h
Midday
4 h
Later
0 h
Morning · 08:00–12:00 Excellent Summit winds around 10-20 mph. Gusts around 15-25 mph are possible on exposed ground. Rain is possible during the main walking period, but its timing may shift by several hours.
87
Afternoon · 12:00–17:00 Good Summit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground. Rain is possible during the main walking period, but its timing may shift by several hours.
83

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

Daytime · exposed rockClimbing & scramblingBetaGood conditions for exposed scrambling. Good79 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Good conditions for exposed scrambling. It should stay mostly dry, but a passing shower could leave the rock damp and slippery. Gusts of 20–30 mph will be noticeable on exposed ridges. The rock around the summit is mostly chalk, a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.

Rock surfaceDry initially; rain possiblePeak gust20-30 mphRainPossible · 38%
Main concernrain possible despite mostly dry conditions being favoured
Representative rock around the summit Chalk Lewes Nodular Chalk Formation
Origin
Sedimentary
Broad rock-response group
Limestone
Mapping
BGS Geology 50K · 1:50,000
Summit area
Limestone in 100% of 17 BGS samples within 350 m
Rock-response profile
Moderate confidence
View the summit BGS record

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.

Geological detail and BGS records
Mapped variation

3 rock types appear in the mapped samples

Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.

Summit-area sample Chalk Lewes Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Holywell Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Seaford Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record

Generic exposed scrambling terrain; BGS summit-area bedrock samples are 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

A broad surface report is enough; you do not need to identify a particular route.

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.

Explore the dedicated aurora forecast, meteor shower forecast or dark-sky and astrophotography 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.

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 Firle Beacon on Monday 9 November 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

Confidence: Medium
Overall hill weather68Mixed
Summit wind · 08:00-17:005-20 mph southeasterly Summit gusts · 08:00-17:0015-25 mph Feels like4 to 8°C PrecipitationUp to around 2 mm Cloud-free summit estimate90% Cloud base through day400-700 m Freezing levelAbove summit DaylightSunrise 07:06 · Sunset 16:20 · 9.2 hours daylight

The day on the hill

A mixed day on Firle Beacon: light winds and clear tops for most of the day.

Wind

On the summit expect a south-easterly wind of 5–20 mph for most of the day, with gusts of 15–25 mph at the windiest. Lower down on the open hillside the wind will be light, under 10 mph.

Cloud and visibility

The tops are likely to stay mostly clear of cloud, though brief patches cannot be ruled out. It looks hazy, so views may be limited even when the tops are clear.

Rain and ground

Drizzle at first, clearing by midday. The timing could shift by a few hours.

Warmth and kit

On the tops it will be around 8 to 12°C, feeling like 4 to 8°C in the wind. The freezing level is above the summits.

Daylight

Sunset is around 4:20pm, so allow time to get off the hill before dark, and carry a head torch.

Forecast confidence

It's still five days off and could change, so check again nearer the time.

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
Morning · 08:00–12:00 Good Summit winds around 10-20 mph. Gusts around 15-25 mph are possible on exposed ground. Summit cloud becomes more persistent later. Rain is forecast during this period. Rain is possible during the morning, but forecast models disagree on whether it will fall. Rain is possible during the main walking period, but its timing may shift by several hours.
73
Afternoon · 12:00–17:00 Mixed Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground. Summit cloud becomes more persistent later. Rain is forecast during this period. Rain is possible during the afternoon, but forecast models disagree on whether it will fall. Rain is possible during the main walking period, but its timing may shift by several hours.
62

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

Daytime · exposed rockClimbing & scramblingBetaPoor conditions for exposed scrambling: wet, slippery rock. Poor20 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Poor conditions for exposed scrambling. The rock is likely to be wet and slippery through the day. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly chalk, a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.

Rock surfaceWet rock likelyPeak gust15-25 mphRain0.9 mm
Main concernwet rock likely
Representative rock around the summit Chalk Lewes Nodular Chalk Formation
Origin
Sedimentary
Broad rock-response group
Limestone
Mapping
BGS Geology 50K · 1:50,000
Summit area
Limestone in 100% of 17 BGS samples within 350 m
Rock-response profile
Moderate confidence
View the summit BGS record

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.

Geological detail and BGS records
Mapped variation

3 rock types appear in the mapped samples

Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.

Summit-area sample Chalk Lewes Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Holywell Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Seaford Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record

Generic exposed scrambling terrain; BGS summit-area bedrock samples are 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

A broad surface report is enough; you do not need to identify a particular route.

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.

Explore the dedicated aurora forecast, meteor shower forecast or dark-sky and astrophotography 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.

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 Firle Beacon on Tuesday 10 November 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

Confidence: Unavailable
Overall hill weather85Excellent
Summit wind · 08:00-17:005-20 mph southwesterly Summit gusts · 08:00-17:0015-25 mph Feels like10 to 14°C PrecipitationLittle or none Cloud-free summit estimate90% Cloud base through day300-600 m Freezing levelAbove summit DaylightSunrise 07:07 · Sunset 16:18 · 9.2 hours daylight

The day on the hill

A fine day on Firle Beacon: dry, with light winds and clear tops for most of the day.

Things to watch

There is a small chance of a thunderstorm from early morning into the evening. If you hear thunder, head down off the tops and away from ridges. Storms can bring sudden strong gusts and heavy rain. Storm timing could easily shift by a few hours.

Wind

On the summit expect light winds of up to 15 mph, mainly south-westerly, with gusts of 15–25 mph at the windiest. Lower down on the open hillside the wind will be light, under 10 mph.

Cloud and visibility

The tops are likely to stay mostly clear of cloud, though brief patches cannot be ruled out.

Rain and ground

It should stay dry.

Warmth and kit

The freezing level is above the summits.

Daylight

Sunset is around 4:20pm, so allow time to get off the hill before dark, and carry a head torch.

Forecast confidence

Cloud heights are particularly hard to pin down today. It's still six days off and could change, so check again nearer the time.

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
Morning · 08:00–12:00 Good Summit winds around 10-20 mph. Gusts around 15-25 mph are possible on exposed ground.
84
Afternoon · 12:00–17:00 Excellent Summit winds around 5-15 mph. Gusts around 15-25 mph are possible on exposed ground.
86

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

Daytime · exposed rockClimbing & scramblingBetaFair conditions for exposed scrambling: a chance of thunderstorms. Mixed60 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Fair conditions for exposed scrambling. After recent rain the rock may still be wet in places, especially shaded holds and drainage lines. There is a small chance of a thunderstorm from early morning into the evening. If you hear thunder, get off exposed rock and ridges. The rock around the summit is mostly chalk, a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.

Rock surfaceDry overhead; seepage uncertainPeak gust15-25 mphRain0.0 mm
Main factorslow thunderstorm risk on exposed grounddamp or incompletely dried rock possible
Representative rock around the summit Chalk Lewes Nodular Chalk Formation
Origin
Sedimentary
Broad rock-response group
Limestone
Mapping
BGS Geology 50K · 1:50,000
Summit area
Limestone in 100% of 17 BGS samples within 350 m
Rock-response profile
Moderate confidence
View the summit BGS record

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.

Geological detail and BGS records
Mapped variation

3 rock types appear in the mapped samples

Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.

Summit-area sample Chalk Lewes Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Holywell Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Seaford Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record

Generic exposed scrambling terrain; BGS summit-area bedrock samples are 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

A broad surface report is enough; you do not need to identify a particular route.

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.

Explore the dedicated aurora forecast, meteor shower forecast or dark-sky and astrophotography 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.

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 Firle Beacon on Wednesday 11 November 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

Confidence: Unavailable
Overall hill weather82Good
Summit wind · 08:00-17:000-15 mph northerly Summit gusts · 08:00-17:0010-20 mph Feels like6 to 10°C PrecipitationUp to around 2 mm Cloud-free summit estimate90% Cloud base through day300-900 m Freezing levelAbove summit DaylightSunrise 07:09 · Sunset 16:17 · 9.1 hours daylight

The day on the hill

A good day on Firle Beacon: light winds and clear tops for most of the day.

Wind

On the summit expect light winds of up to 15 mph, mainly northerly, with gusts of 10–20 mph at the windiest. It gets windier still after dark, with summit gusts of 20–30 mph, so bear that in mind if you will be out late.

Cloud and visibility

The tops are likely to stay mostly clear of cloud, though brief patches cannot be ruled out. It looks hazy, so views may be limited even when the tops are clear.

Rain and ground

Drizzle sets in around midday.

Warmth and kit

On the tops it will be around 8 to 12°C, feeling like 6 to 10°C in the wind. The freezing level is above the summits. Pack waterproofs, and keep a warm layer dry in your pack.

Daylight

Sunset is around 4:15pm, so allow time to get off the hill before dark, and carry a head torch.

Forecast confidence

It's still seven days off and could change, so check again nearer the time.

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
Morning · 08:00–12:00 Good Summit winds around 0-10 mph. Gusts around 0-10 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later.
79
Afternoon · 12:00–17:00 Excellent Summit winds around 0-15 mph. Gusts around 10-20 mph are possible on exposed ground. Rain is forecast during this period.
85

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

Daytime · exposed rockClimbing & scramblingBetaMixed conditions for exposed scrambling: wet, slippery rock. Mixed55 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Mixed conditions for exposed scrambling. The rock is likely to be wet and slippery through the day. Cloud on the tops may make route-finding and retreat harder. The rock around the summit is mostly chalk, a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, taken from geological maps around the summit, so the rock on your line may differ.

Rock surfaceWet rock likelyPeak gust10-20 mphRain3.0 mm
Main concernwet rock likely
Representative rock around the summit Chalk Lewes Nodular Chalk Formation
Origin
Sedimentary
Broad rock-response group
Limestone
Mapping
BGS Geology 50K · 1:50,000
Summit area
Limestone in 100% of 17 BGS samples within 350 m
Rock-response profile
Moderate confidence
View the summit BGS record

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds. These are general notes for each rock type, from geological map samples at and around the summit. The rock on your line can differ, and lichen, vegetation and seepage all change how it feels underfoot.

Geological detail and BGS records
Mapped variation

3 rock types appear in the mapped samples

Samples around the summit inform the main rock-response profile, with the summit pin shown separately where it differs. Route samples add further context, but this is not a continuous geological survey.

Summit-area sample Chalk Lewes Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Holywell Nodular Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record
Summit-area sample Chalk Seaford Chalk Formation

Chalk is a soft white limestone. It has little grip and is very slippery when wet. It is soft and crumbly and not to be trusted for holds.

BGS record

Generic exposed scrambling terrain; BGS summit-area bedrock samples are 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

A broad surface report is enough; you do not need to identify a particular route.

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.

Explore the dedicated aurora forecast, meteor shower forecast or dark-sky and astrophotography 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.

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 Firle Beacon on Thursday 12 November 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

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

Forecast run: 2026-11-05

A forecast is part of the decision.

Mountain weather can differ sharply from conditions in the valley. Check official warnings, carry appropriate navigation and clothing, and be ready to change the plan. Read how Mountain Weather forecasts are produced and where their limits lie.

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