Beinn Stacath Weather Forecast – 772m, Argyll and Loch Lomond

Sunday 20 September 2026Confidence: Medium

Overall hill weather44/100Poor

Wind25-45 mph westerly Gusts50-60 mph Feels like-4 to 0°C PrecipitationUp to around 2 mm Cloud-free summit estimate60% Cloud base through day500-1,300 m Freezing levelAbove summit DaylightSunrise 06:58 · Sunset 19:23 · 12.4 hours daylight

The day on the hill

Strong gusts on Beinn Stacath: summit wind broadly 25-45 mph, with gusts 50-60 mph at times (strong winds).

Wind & exposure

Much calmer lower down - generally 15-25 mph in the valley, rising towards the tops. Gusts may knock you off balance on exposed ground, even between spells of lighter wind.

Cloud & views

Cloud base around 500–800 m in the morning, then around 1000–1300 m around midday and 800–1100 m by late afternoon. Summit cloud is extensive early, becoming less frequent later.

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

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

Rain & temperature

The ground is likely to be wet after recent rain. Some rain is likely, totalling up to around 2 mm, but its timing and local amounts are uncertain.

Cold on exposed tops: air temperature broadly 2 to 6°C, feeling around -4 to 0°C in the wind.

Forecast confidence

Cloud height remains uncertain, especially where it is close to summit level. Keep windproof and warm layers readily available.

Cloud-height uncertainty could put the summit in or out of cloud, even where forecasts agree on the wider cloud cover.

Cloud-free timing: Around 25% early, improving to around 60% later.

Sunshine context Model-grid estimate, not summit sunshine

The surrounding model grid indicates 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: 1.5 h
Later: 1 h

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

Morning · 08:00–12:00 Poor Summit winds around 30-40 mph. Gusts around 45-55 mph are possible on exposed ground. Gusts may knock you off balance on exposed ground, even between spells of lighter wind. Summit cloud is more persistent early in this period, with better prospects later.

33/100

Afternoon · 12:00–17:00 Mixed Summit winds around 25-35 mph. Gusts around 40-50 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges.

54/100

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

Overnight · 17:00–08:00Wild campingBetaGusts near 35 mph make meaningful shelter important. 59/100Mixed · 600 m View detailsHide details

Night beginning Sunday 20 September 2026

Full overnight outlook

Open-hillside camping looks mixed overall around 600 m (59/100). Open-ground gusts may reach about 35 mph. Seek meaningful shelter. Peak gusts range from about 25 mph at 300 m to 35 mph at 600 m. A little rain may coincide with pitching or packing up. Some condensation is possible overnight.

Overnight rain0.8 mm Open ground · 600 m17 mph · gusts 33 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 4°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc: 70%
Moonrise: 17:44 BST
Moonset: 23:51 BST

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

Overnight window: 20 Sep, 17:00 BST to 21 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m59/100 · mixed

Wind / gust: 14 mph / 27 mph
Typical / low: 7.4°C / 7.0°C · much of the night
In cloud: 0% of modelled night
Condensation: Moderate

600 m59/100 · mixed

Wind / gust: 17 mph / 33 mph
Typical / low: 7.4°C / 7.0°C · much of the night
In cloud: 0% of modelled night
Condensation: Moderate

Warmth planning: As a broad starting point, consider a 3-season bag with an ISO/EN comfort rating at or below about 4°C. Allow more margin if you sleep cold or expect fatigue, and use an adequate insulated mat. Dampness is possible, so keep the sleep system dry and ensure its insulation remains effective if damp.

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

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

Daytime · exposed rockClimbing & scramblingBetaRock may be damp or still drying. Gusts near 50 mph may affect balance on exposed rock. Poor11/100 View detailsHide details

Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (11/100). Recent rain may leave seepage and damp rock, especially on shaded sections. The mapped summit rock is Lamprophyre (North Britain Siluro-Devonian Calc-Alkaline Dyke Suite). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Gusts may reach about 50 mph. Crosswinds can make exposed ridges substantially more serious.

Rock surfaceDry overhead; seepage uncertainPeak gust51 mphRain0.1 mm

Main factorsgusts around 50 mphdamp or incompletely dried rock possible

Mapped summit rock Lamprophyre North Britain Siluro-Devonian Calc-Alkaline Dyke Suite

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

View the summit BGS record

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

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

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

Overnight · Aurora, stars & meteorsAfter 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

Poor 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, 23:40 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, 21:35 BST to 22:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky.
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 Cloud is likely to obscure much of the sky.
21 Sep, 00:00 BST to 01:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky.
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	Poor 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	Poor 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, 17:50 BST.

Moonset around 20 Sep, 23:40 BST.

Full darkness: 20 Sep, 21:35 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 845 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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Monday 21 September 2026Confidence: Medium

Overall hill weather38/100Poor

Wind20-30 mph westerly Gusts30-40 mph Feels like4 to 8°C PrecipitationUp to around 2 mm Cloud-free summit estimate35% Cloud base through day600-900 m Freezing levelAbove summit DaylightSunrise 07:00 · Sunset 19:20 · 12.3 hours daylight

The day on the hill

Frequent summit cloud on Beinn Stacath: summit wind broadly 20-30 mph, with gusts 30-40 mph at times (strong winds). Hill cloud may make navigation difficult, with very poor visibility in wetter spells.

Wind & exposure

Much calmer lower down - generally 5-15 mph in the valley, rising towards the tops.

Cloud & views

Cloud base mostly around 600–900 m through daylight. Summit cloud is likely, but brief clear spells remain possible if the cloud sits higher than expected.

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

Cloud may hang lower on western slopes and lift somewhat on the eastern side, but local terrain can differ. Very little direct sunshine is likely, with extensive cloud.

Drizzle is forecast for much of the day. The forecast total is up to around 2 mm, but local amounts will vary.

Forecast models differ on summit wind strength: around 20-33 mph at walker height, with gusts 27-47 mph.

Forecast confidence

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

Cloud-height uncertainty could put the summit in or out of cloud, even where forecasts agree on the wider cloud cover.

Sunshine context Model-grid estimate, not summit sunshine

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

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

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

Morning · 08:00–12:00 Poor Summit winds around 15-30 mph. Gusts around 30-40 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges. Rain is forecast during this period.

42/100

Afternoon · 12:00–17:00 Poor Summit winds around 20-30 mph. Gusts around 30-40 mph are possible on exposed ground. Buffeting may affect balance on exposed ground, particularly near ridges and edges. Rain is forecast during this period.

33/100

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

Overnight · 17:00–08:00Wild campingBetaGusts near 40 mph make meaningful shelter important. 39/100Poor · 600 m View detailsHide details

Night beginning Monday 21 September 2026

Full overnight outlook

Open-hillside camping looks poor overall around 600 m (39/100). A lower pitch near 300 m looks more comfortable. Conditions are less suitable by 600 m. Open-ground gusts may reach about 40 mph. Seek meaningful shelter. Peak gusts range from about 35 mph at 300 m to 40 mph at 600 m. A little rain may coincide with pitching or packing up. Condensation risk is high near 300 and 600 m, so a wet pack-up is possible. Ventilation will matter.

Overnight rain0.8 mm Open ground · 600 m24 mph · gusts 40 mph Morning pack-upDampness possible Sleeping-bag warmthISO comfort rating about 8°C or lower

Moon overnight

Waxing gibbous moon

Illuminated disc: 78%
Moonrise: 18:02 BST
Moonset: 01:13 next morning BST

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

Overnight window: 21 Sep, 17:00 BST to 22 Sep, 08:00 BST. Approximate open-horizon times; hills can hide the Moon. Still take a headtorch.

Elevation reference (open ground)

300 m59/100 · mixed

Wind / gust: 20 mph / 33 mph
Typical / low: 11.9°C / 10.8°C
In cloud: 0% of modelled night
Condensation: High

600 m39/100 · poor

Wind / gust: 24 mph / 40 mph
Typical / low: 11.9°C / 10.8°C
In cloud: 0% of modelled night
Condensation: High

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

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

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

Daytime · exposed rockClimbing & scramblingBetaWet rock is likely. Gusts near 35 mph may affect balance on exposed rock. Poor9/100 View detailsHide details

Generic exposed-rock guidance

Full climbing & scrambling outlook

Conditions for exposed scrambling look very poor (9/100). Rain during the climbing period is likely to leave rock wet and more slippery. The mapped summit rock is Lamprophyre (North Britain Siluro-Devonian Calc-Alkaline Dyke Suite). Generally grippy when dry and often still positive when damp, but wet slabs, lichen, polish and drainage lines can remain slippery. Gusts may reach about 35 mph. Crosswinds can make exposed ridges substantially more serious. Cloud may also make route-finding and retreat harder.

Rock surfaceWet rock likelyPeak gust36 mphRain1.1 mm

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

Mapped summit rock Lamprophyre North Britain Siluro-Devonian Calc-Alkaline Dyke Suite

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

View the summit BGS record

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

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

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

Overnight · Aurora, stars & meteorsAfter 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: 22 Sep, 02:00 BST to 03:00 BST.

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

Moon-free dark sky: 22 Sep, 01:05 BST to 04:55 BST.

Sky conditions through the night

Fully dark periods. Conditions can change between forecast hours.
Time	Viewing conditions
21 Sep, 21:30 BST to 22:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky.
21 Sep, 22:00 BST to 23:00 BST	Poor sky conditions Cloud is likely to obscure much of the sky.
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.
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.

Moon, darkness and meteor showers

Gibbous moon, about 78% illuminated.

Moonrise around 21 Sep, 18:05 BST.

Moonset around 22 Sep, 01:05 BST.

Full darkness: 21 Sep, 21:30 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.