Mountain Weather

Box Hill weather forecast.

150 m summit in Bannau Brycheiniog (Brecon Beacons). 8 forecast days covering wind, cloud, rain and temperature, updated 21 September 2026 at 16:08 UTC.

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Confidence: High
Overall hill weather100/100Excellent
Wind0-15 mph northwesterly Gusts10-20 mph Feels like6 to 10°C PrecipitationLittle or none Cloud-free summit estimate95% Freezing levelAbove summit DaylightSunrise 06:52 · Sunset 19:10 · 12.3 hours daylight

The day on the hill

Little rain and limited summit cloud on Box Hill: summit wind broadly 0-15 mph, with gusts 10-20 mph at times (light winds). Patchy mist is possible in sheltered valleys early on.

Cloud & views

Cloud base around 300–600 m in the morning, lifting to 900–1200 m by late afternoon. The summit is likely to stay mostly clear.

Rain & temperature

Little or no rain is forecast.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level.

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
3 h
Midday
4 h
Later
2 h
Morning · 08:00–12:00 Excellent Summit winds around 0-10 mph. Gusts around 10-20 mph are possible on exposed ground.
100/100
Afternoon · 12:00–17:00 Excellent Summit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground.
100/100

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

Daytime · exposed rockClimbing & scramblingBetaRock is likely to be mostly dry, but check for local dampness. Excellent95/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look excellent (95/100). Rock is likely to be mostly dry, though seepage and shaded holds are not resolved. The mapped summit rock is Limestone (Forest Marble Formation). Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

Rock surfaceProbably dryPeak gust13 mphRain0.0 mm
Mapped summit rock Limestone Forest Marble 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 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

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.

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 Box Hill on Monday 21 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

Confidence: High
Overall hill weather90/100Excellent
Wind0-10 mph southwesterly Gusts5-15 mph Feels like12 to 16°C PrecipitationLittle or none Cloud-free summit estimate90% Cloud base through day100-1,400 m Freezing levelAbove summit DaylightSunrise 06:54 · Sunset 19:08 · 12.2 hours daylight

The day on the hill

Little rain and limited summit cloud on Box Hill: summit wind broadly 0-10 mph, with gusts 5-15 mph at times (light winds).

Rain & temperature

Little or no rain is forecast.

Cloud-free timing: Around 65% early, improving to around 95% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 6.9 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
1.9 h
Midday
2.3 h
Later
1.5 h
Morning · 08:00–12:00 Excellent 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.
89/100
Afternoon · 12:00–17:00 Excellent Summit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground.
90/100

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

Daytime · exposed rockClimbing & scramblingBetaRock is likely to be mostly dry, but check for local dampness. Excellent95/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look excellent (95/100). Rock is likely to be mostly dry, though seepage and shaded holds are not resolved. The mapped summit rock is Limestone (Forest Marble Formation). Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

Rock surfaceProbably dryPeak gust8 mphRain0.0 mm
Mapped summit rock Limestone Forest Marble 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 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

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.

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 Box Hill on Tuesday 22 September 2026. It asks about intentions, not whether you actually went out. No name or account is needed.

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

Confidence: High
Overall hill weather83/100Good
Possible inversionLow confidence · Early morning
Wind5-20 mph northwesterly Gusts20-30 mph Feels like10 to 14°C PrecipitationLittle or none Cloud-free summit estimate95% Cloud base through day800-1,800 m Freezing levelAbove summit DaylightSunrise 06:55 · Sunset 19:05 · 12.2 hours daylight

The day on the hill

On Box Hill: summit wind broadly 5-20 mph, with gusts 20-30 mph at times (a moderate breeze).

Things to watch

Thunder watch from early morning into the afternoon: a small but credible risk is present. Watch for growing clouds and leave exposed tops if thunder develops.

If a thunderstorm develops, sudden gusts and heavy rain can change conditions quickly. Patchy mist is possible in sheltered valleys early on.

Cloud & views

Cloud base around 1500–1800 m in the morning, then around 800–1100 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.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 8.6 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
1.4 h
Midday
2.5 h
Later
3 h
Morning · 08:00–12:00 Good Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground.
83/100
Afternoon · 12:00–17:00 Good Summit winds around 5-15 mph. Gusts around 15-25 mph are possible on exposed ground.
83/100

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

Daytime · exposed rockClimbing & scramblingBetaRock is likely to be mostly dry, but check for local dampness. Slight thunderstorm risk. Avoid exposed rock if storms develop. Good78/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look good (78/100). Rock is likely to be mostly dry, though seepage and shaded holds are not resolved. The mapped summit rock is Limestone (Forest Marble Formation). Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger. Slight thunderstorm risk, broadly from early morning into the afternoon. Avoid committing to exposed ground if storms develop.

Rock surfaceProbably dryPeak gust22 mphRain0.0 mm
Main concernslight thunderstorm risk on exposed ground
Mapped summit rock Limestone Forest Marble 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 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

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.

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 Box Hill on Wednesday 23 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

Confidence: High
Overall hill weather90/100Excellent
Wind5-15 mph southeasterly Gusts10-20 mph Feels like0 to 4°C PrecipitationLittle or none Cloud-free summit estimate95% Freezing levelAbove summit DaylightSunrise 06:57 · Sunset 19:03 · 12.1 hours daylight

The day on the hill

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

Cloud & views

Cloud base around 400–700 m in the morning, lifting to 1300–1600 m around midday. The summit is likely to stay mostly clear.

Rain & temperature

Little or no rain is forecast. Cold on exposed tops: air temperature broadly 2 to 6°C, feeling around 0 to 4°C in the wind.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 10 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
2.9 h
Midday
2.5 h
Later
3 h
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 Excellent Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground.
90/100

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

Daytime · exposed rockClimbing & scramblingBetaRock is likely to be mostly dry, but check for local dampness. Excellent95/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look excellent (95/100). Rock is likely to be mostly dry, though seepage and shaded holds are not resolved. The mapped summit rock is Limestone (Forest Marble Formation). Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

Rock surfaceProbably dryPeak gust15 mphRain0.0 mm
Mapped summit rock Limestone Forest Marble 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 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

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.

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 Box Hill 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

Confidence: Medium
Overall hill weather94/100Excellent
Wind5-15 mph southwesterly Gusts10-20 mph Feels like2 to 6°C PrecipitationLittle or none Cloud-free summit estimate90% Cloud base through day100-1,800 m Freezing levelAbove summit DaylightSunrise 06:59 · Sunset 19:01 · 12.0 hours daylight

The day on the hill

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

Cloud & views

Cloud height and summit clearance are uncertain. Check again nearer the time.

Rain & temperature

Little or no rain is forecast.

Forecast confidence

Forecast models disagree on cloud cover.

Cloud-free timing: Around 65% early, improving to around 95% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 8.5 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
Less than 1 hour
Midday
4 h
Later
2.3 h
Morning · 08:00–12:00 Excellent Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground. Summit cloud is more persistent early in this period, with better prospects later.
92/100
Afternoon · 12:00–17:00 Excellent Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground.
95/100

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

Daytime · exposed rockClimbing & scramblingBetaRock is likely to be mostly dry, but check for local dampness. Excellent95/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look excellent (95/100). Rock is likely to be mostly dry, though seepage and shaded holds are not resolved. The mapped summit rock is Limestone (Forest Marble Formation). Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

Rock surfaceProbably dryPeak gust14 mphRain0.0 mm
Mapped summit rock Limestone Forest Marble 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 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

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.

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 Box Hill 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

Confidence: Medium
Overall hill weather92/100Excellent
Wind0-15 mph northeasterly Gusts10-20 mph Feels like4 to 8°C PrecipitationLittle or none Cloud-free summit estimate95% Freezing levelAbove summit DaylightSunrise 07:00 · Sunset 18:58 · 12.0 hours daylight

The day on the hill

Little rain and limited summit cloud on Box Hill: summit wind broadly 0-15 mph, with gusts 10-20 mph at times (light winds). Patchy mist is possible in sheltered valleys early on.

No summit cloud is forecast through the assessed daylight hours.

Rain & temperature

Little or no rain is forecast.

Forecast confidence

Forecast models disagree on cloud cover.

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
Morning · 08:00–12:00 Excellent Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground. Rain is possible during the main walking period, but its timing may shift by several hours.
93/100
Afternoon · 12:00–17:00 Excellent Summit winds around 0-10 mph. Gusts around 5-15 mph are possible on exposed ground. Rain is possible during the main walking period, but its timing may shift by several hours.
91/100

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

Daytime · exposed rockClimbing & scramblingBetaPatchy rain could leave exposed holds damp or slippery. Excellent87/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look good (87/100). Likely to stay mostly dry, but patchy rain remains possible and could leave exposed rock damp or slippery. The mapped summit rock is Limestone (Forest Marble Formation). Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

Rock surfaceDry initially; rain possiblePeak gust14 mphRainPossible · 40%
Main concernrain possible despite mostly dry conditions being favoured
Mapped summit rock Limestone Forest Marble 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 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

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.

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 Box Hill 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

Confidence: Unavailable
Overall hill weather93/100Excellent
Wind10-20 mph southeasterly Gusts20-30 mph Feels like10 to 14°C PrecipitationUp to around 2 mm Cloud-free summit estimate95% Freezing levelAbove summit DaylightSunrise 07:02 · Sunset 18:56 · 11.9 hours daylight

The day on the hill

Mostly dry with limited summit cloud on Box Hill: summit wind broadly 10-20 mph, with gusts 20-30 mph at times (a moderate breeze).

Cloud & views

Cloud base around 1400–1700 m in the morning, then around 1900–2200 m around midday and 1400–1700 m by late afternoon. The summit is likely to stay mostly clear.

Cloud may hang lower on southeastern slopes and lift somewhat on the northwestern side, but local terrain can differ. Drizzle is forecast at times.

The forecast total is up to around 2 mm, but local amounts will vary. Forecast models differ on summit wind strength.

Treat the wind figures as a guide.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. Overall confidence is unavailable: insufficient comparable wind, rain guidance.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 2.4 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
0.9 h
Midday
0.9 h
Later
0 h
Morning · 08:00–12:00 Excellent Summit winds around 10-20 mph. Gusts around 20-30 mph are possible on exposed ground. Rain is forecast during this period.
92/100
Afternoon · 12:00–17:00 Excellent Summit winds around 10-20 mph. Gusts around 15-25 mph are possible on exposed ground.
94/100

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

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Mixed55/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look mixed (55/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Limestone (Forest Marble Formation). Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

Rock surfaceWet rock likelyPeak gust24 mphRain0.5 mm
Main concernwet rock likely
Mapped summit rock Limestone Forest Marble 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 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

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.

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 Box Hill 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

Confidence: Unavailable
Overall hill weather94/100Excellent
Wind5-15 mph westerly Gusts10-20 mph Feels like12 to 16°C PrecipitationLittle or none Cloud-free summit estimate95% Freezing levelAbove summit DaylightSunrise 07:03 · Sunset 18:54 · 11.8 hours daylight

The day on the hill

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

Cloud & views

Cloud base around 400–700 m in the morning, lifting to 1100–1400 m around midday and 1000–1300 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 75% early, improving to around 95% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 10.7 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
2.8 h
Morning · 08:00–12:00 Excellent Summit winds around 5-15 mph. Gusts around 5-15 mph are possible on exposed ground.
90/100
Afternoon · 12:00–17:00 Excellent Summit winds around 5-15 mph. Gusts around 10-20 mph are possible on exposed ground.
98/100

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. Good82/100 View detailsHide details
Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look good (82/100). Some rock may still be damp or drying, especially on polished slabs and vegetated sections. The mapped summit rock is Limestone (Forest Marble Formation). Usually positive where it is rough and dry, but polished limestone can become very slippery when wet and seepage may linger.

Rock surfaceDamp or dryingPeak gust16 mphRain0.0 mm
Main concerndamp or incompletely dried rock possible
Mapped summit rock Limestone Forest Marble 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 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

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.

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 Box Hill 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

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

Forecast run: 2026-09-21

Keep exploring

Weather around Box Hill.

Compare the summit forecast with the wider regional picture and nearby peaks before choosing a route.

Regional mountain forecastBannau Brycheiniog (Brecon Beacons)View area →
Leckhampton Hill293 m · 50.0 km awayForecast →Cleeve Hill330 m · 57.2 km awayForecast →Ysgyryd Fawr (Skirrid)486 m · 70.5 km awayForecast →Herefordshire Beacon338 m · 70.9 km awayForecast →

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.

Choose another summit