UK forecast Cornwall

Northern lights Cornwall tonight

Cornwall at ~50°N magnetic latitude needs a G2-G3 storm (Kp 6-7) for aurora to reach its skies. The Atlantic-facing north coast and Bodmin Moor Dark Sky Landscape are the best positions. During the G5 storm of May 2024, aurora was photographed across the county.

Aurora visibility - Cornwall

Unlikely tonight

Kp 1 is well below the Kp 6–7 threshold needed for aurora to be visible from Cornwall.

Current Kp

1

of 9

Threshold for Cornwall: Kp 6–7 Magnetic latitude: ~50°N Updated: 21 May, 06:16 UTC
↓ Bz nT Solar wind km/s Density p/cm³
Conditions right now: Kp + Bz + solar wind + cloud + moon

7-day outlook for Cornwall

Today

21 May

Quiet

Tomorrow

22 May

Quiet

Sat

23 May

Quiet

Sun

24 May

Quiet

Mon

25 May

Quiet

Tue

26 May

Quiet

Wed

27 May

Quiet

Based on CME arrival predictions from NASA DONKI. Arrival times ±6 hours.

What Kp is needed here?

Cornwall sits at a magnetic latitude of approximately 50°N. The Kp index - a global measure of geomagnetic activity on a scale from 0 (quiet) to 9 (extreme storm), updated every 3 hours - needs to reach Kp 6–7 before the auroral oval expands far enough south to be visible from here.

At Kp 6–7, visibility is possible from Cornwall but skies need to be clear and dark. Cloud cover and light pollution remain the main obstacles even when Kp is high enough.

Best dark sky sites near Cornwall

Light pollution is the biggest obstacle after cloud cover. These sites give you the best dark northern horizon within reach.

Bodmin Moor Dark Sky Landscape

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Bortle Class 3 - Rural sky, good dark sky Central Cornwall - accessible from the A30

Bodmin Moor holds status as a Dark Sky Landscape - a formal recognition of its exceptional sky conditions. The elevated granite plateau in central Cornwall sits above coastal cloud inversions on many nights, giving reliable clear sky when the coasts are covered. Brown Willy and Rough Tor - the two highest points - give north-facing moorland positions with no artificial light for several kilometres. Bortle 3 conditions are consistent across the higher moor, and the area is accessible from the A30 without long walks. During the G5 storm of May 2024, aurora was photographed from Bodmin Moor.

Cape Cornwall and the north coast near St Just

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Bortle Class 2 - Excellent dark sky Near St Just - the far west of Cornwall

Cape Cornwall at the far south-western tip is one of the few capes in England that actually faces north at its headland end, giving a direct Atlantic horizon with no land obstruction for hundreds of miles. The surrounding area near St Just is among the darkest in England - Bortle 2 conditions with minimal settlement lighting in the far west. During major events, aurora photographed from here appears over the Atlantic Ocean with the coastal cliff foreground. The approach road is narrow but manageable; park at Cape Cornwall and walk the coast path for the best horizon positions.

Carnewas and Bedruthan Steps

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Bortle Class 3 - Rural sky, good dark sky 10 km north of Newquay - approximately 15 minute drive

The north Cornwall coast between Newquay and Padstow gives a north-facing Atlantic horizon with sea stacks and cliff foregrounds. Carnewas, above Bedruthan Steps, provides a National Trust car park with access to the cliff top. The surrounding farmland is low-density and well-lit only near Newquay itself. At 10 km from Newquay, sky brightness drops to Bortle 3. The cliff-top position faces directly north across the Atlantic, making it one of the better horizon positions in north Cornwall for low aurora arcs during G3+ storms.

Best time to see the northern lights in Cornwall

At 50°N magnetic latitude, Cornwall sits at the lower end of regular aurora territory. Only the deep mid-winter months of November through January offer nights dark enough for aurora to be visible, and only then when a significant geomagnetic storm pushes the auroral oval this far south.

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Activity peaks around the September and March equinoxes, when Earth's magnetic field geometry is most favourable for coupling with the solar wind. Events during these two windows tend to produce the strongest displays of the year for observers at Cornwall's latitude.

Outside November through January, twilight is too bright for aurora viewing even during significant storms. The season is short, but the equinox months on either side of winter can extend it slightly when storm timing aligns.

Common questions

Aurora watching in Cornwall - what storms reach here, the best sites, and how often it happens.

Can you see the northern lights from Cornwall?
Yes, during strong geomagnetic storms. Cornwall at 50°N magnetic latitude requires a G2-G3 storm (Kp 6-7) for aurora to reach the sky. During the G5 storm of May 2024 - the strongest in two decades - aurora was photographed from St Ives, Newquay, Bodmin Moor, and the far west of Cornwall, including from Cape Cornwall. The Atlantic-facing north coast and the elevated Bodmin Moor are the best positions. Outside of G3+ events, aurora will not reach this far south.
What Kp is needed to see aurora in Cornwall?
Kp 6-7 from dark sites on the north coast and Bodmin Moor. Cornwall sits at approximately 50°N magnetic latitude - the same as the south coast of England. The auroral oval needs to expand considerably south of its typical position to reach here. At Kp 6, a faint arc may appear on the northern horizon from the darkest coastal sites. At Kp 7-8, structure becomes visible. At Kp 9 (the level of the May 2024 G5 storm), aurora filled the sky from Cornwall.
What are the best dark sky spots in Cornwall for aurora?
Bodmin Moor is the most reliable site, sitting above coastal cloud and holding formal Dark Sky Landscape status with Bortle 3 conditions. The far west around Cape Cornwall gives Bortle 2 - the darkest accessible sky in Cornwall - with a direct north Atlantic horizon. The north coast near Bedruthan Steps and Carnewas provides a photogenic cliff foreground with a north-facing sea horizon at Bortle 3 conditions. All three require a genuine storm to produce visible aurora.
How often does aurora reach Cornwall?
Rarely under normal solar cycle conditions - perhaps once or twice per solar cycle from dark sites. The current solar maximum (2024-2026) is the most active in two decades, increasing the frequency of G3+ storms that reach Cornish latitudes. The May 2024 G5 event was exceptional. During most years, Cornwall will see 0-2 events from the darkest sites. The Bodmin Moor position above cloud gives a practical advantage over the coastal sites on partially cloudy nights.
Is the north Cornwall coast better than south Cornwall for aurora?
Yes, substantially. The north Cornwall coast faces the Atlantic directly and gives a north-facing ocean horizon without land obstruction. The south coast faces south, meaning the sky to the north - where aurora appears at UK latitudes - is over land with farm and town lighting. For any aurora observation in Cornwall, north-facing coastal positions or elevated moorland are the correct choice. The south coast adds nothing for aurora, however scenic it is for other purposes.

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