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Northern lights Ullapool tonight

Ullapool sits at 58°N magnetic latitude on Loch Broom in Wester Ross - one of the highest-latitude accessible towns on the UK mainland. Kp 3 is enough for aurora on a clear night from the dark sky positions along the loch and on the Coigach peninsula. The Assynt landscape to the north gives open Bortle Class 2 moorland within 25 minutes. The ferry to Lewis and the Outer Hebrides leaves from the town pier, adding island dark sky options to the same base.

Aurora visibility - Ullapool

Unlikely tonight

Kp 1 is well below the Kp 3 threshold needed for aurora to be visible from Ullapool.

Current Kp

1

of 9

Threshold for Ullapool: Kp 3 Magnetic latitude: ~58°N Updated: 21 May, 17:49 UTC
↓ Bz nT Solar wind km/s Density p/cm³
Conditions right now: Kp + Bz + solar wind + cloud + moon

7-day outlook for Ullapool

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?

Ullapool sits at a magnetic latitude of approximately 58°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 3 before the auroral oval expands far enough south to be visible from here.

At Kp 3, visibility is possible from Ullapool 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 Ullapool

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

Loch Broom north shore

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Bortle Class 2 - Excellent dark sky 5 km from Ullapool - approximately 8 minute drive

The A835 north of Ullapool follows the north shore of Loch Broom for 8 km before turning inland toward the Strath More valley. The lochside pull-ins on the north shore give a west and northwest view across the open sea loch toward Beinn Ghobhlach (635 m) on the far shore. Ullapool's lights are behind to the south and southeast. The road is straight and gives several lay-by options; the first clear one north of the village is 5 km from the harbour. Bortle Class 2 from the water's edge. On calm nights the loch surface mirrors any overhead activity, giving a reflected arc on the water as well as the sky. The road is well-maintained year-round.

Achnahaird Bay

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Bortle Class 2 - Excellent dark sky 25 km from Ullapool - approximately 30 minute drive

Achnahaird Bay is a remote Atlantic beach on the Coigach peninsula, reached from Achiltibuie via the single-track Polbain road. The bay faces northwest with an open North Atlantic horizon and no artificial light in any direction except a faint glow from Ullapool to the southeast. The beach is wide, flat sand with dunes at the back - shelter from the wind without blocking the sky. Bortle Class 2 throughout. The drive from Ullapool takes 30 minutes via the A835 and the Achiltibuie turn-off; the single-track road requires care after dark. The bay is accessible year-round on foot from the small car park at the end of the Achnahaird road.

Suilven and Stac Pollaidh approach road

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Bortle Class 2 - Excellent dark sky 20 km from Ullapool - approximately 25 minute drive

The Inverpolly road north from the A835 at Drumrunie gives access to the base of Suilven and Stac Pollaidh. The road runs across open Lewisian gneiss moorland with lochans and no tree cover. The sky is open in every direction and the moorland elevation (100-200 m) adds to the dark sky quality. Stac Pollaidh car park on the Inverpolly road is a designated National Nature Reserve access point and is free. Bortle Class 2 throughout the Inverpolly area. The moorland character of the Assynt landscape - flat rock, open water, and big sky - gives among the best Aurora photography settings in mainland Scotland.

Best time to see the northern lights in Ullapool

Ullapool's aurora season runs from late September through to March, when nights are long enough for truly dark skies. The equinox months, September and March, bring a natural boost in geomagnetic activity, making them statistically the best of the season. Summer months bring too much twilight for aurora to be visible at this latitude.

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 Ullapool's latitude.

April through August brings persistent astronomical twilight that washes out aurora completely. Even strong events (Kp 6+) remain invisible during this period because the sky never gets dark enough.

Common questions

Aurora in Ullapool - Loch Broom, Assynt, Outer Hebrides ferry, and what to expect at 58°N.

What Kp is needed for northern lights in Ullapool?
Ullapool sits at 58°N magnetic latitude on Loch Broom in Wester Ross, making it one of the higher-latitude accessible towns on the UK mainland. 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 3 for aurora to be visible from the Bortle Class 2 sites around the town. This is a lower threshold than anywhere in central Scotland and puts Ullapool among the most aurora-accessible mainland UK destinations.
How often can you see aurora from Ullapool?
At 58°N magnetic latitude during the current solar maximum, the auroral oval reaches Ullapool on Kp 3 nights - conditions that occur on average around 30 nights per year globally. Not all of these align with clear sky over Wester Ross, which sits directly in the path of North Atlantic weather systems. A realistic expectation for a week-long winter trip is 2-3 clear nights, with perhaps one of those having active geomagnetic conditions. The equinox months of September-October and February-March give better odds than midwinter for combining clear sky with elevated activity.
Is Ullapool a good base for aurora watching?
Ullapool is one of the best-positioned mainland Scotland towns for aurora. The Loch Broom north shore is dark and accessible within 8 minutes; Achnahaird Bay and the Assynt moorland are within 30 minutes; Stac Pollaidh and the Inverpolly National Nature Reserve give some of the most dramatic open-sky aurora backdrops in Britain. The town has a Caledonian MacBrayne ferry terminal serving the Outer Hebrides, hotels year-round, and a fishing village scale that keeps light pollution minimal. The main drawback is Atlantic cloud cover, which arrives more frequently here than on the east coast.
Can you take a ferry from Ullapool to see aurora from the Outer Hebrides?
CalMac operates the Ullapool to Stornoway ferry on Lewis, with crossings several times daily. Lewis is flat, treeless, and surrounded by open Atlantic - the dark sky conditions on the island are Bortle Class 1-2 across most of its area, better than the mainland. The crossing takes 2 hours 45 minutes. Stornoway has hotels and the island has hire cars available; the Callanish stone circle on the west coast of Lewis gives a prehistoric foreground for aurora photography at Bortle Class 1. This is a meaningful upgrade in dark sky quality for a 2-night island stay.
What makes Ullapool's landscape good for aurora photography?
The Assynt landscape surrounding Ullapool - ancient Lewisian gneiss, scattered lochans, isolated quartzite mountains rising from flat moorland - has a horizontal character that gives large sky visibility from almost any position. The mountains are isolated enough to serve as foreground features without blocking the horizon. Stac Pollaidh (612 m) rising from flat ground gives a distinct silhouette. Loch Broom provides a reflection band. The combination of varied foreground options at a moderate driving distance from a serviced base town is unusual in the Highlands.

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