Live aurora forecast

Northern lights in Þórsmörk tonight

Southern Highlands, Iceland · 64° magnetic latitude · Kp 2 threshold

Aurora visibility · Þórsmörk
1/9
Low chance tonight

Kp 1 is below the threshold for Þórsmörk. Activity would need to rise to Kp 2 before aurora could reach this latitude.

QuietStormExtreme
Threshold
Kp 2
Magnetic latitude
~64°N
Bz ↓ south
- nT
Solar wind
- km/s
Density
- p/cm³
Cloud
-
Conditions right now: - Kp + Bz + solar wind + cloud + moon

Updated: 17 Aug, 17:00 UTC

7-day outlook for Þórsmörk

Tonight shows the live Kp reading. The nights after it show the Kp expected from any coronal mass ejection DONKI predicts will arrive that day, and a quiet baseline of Kp 2 where no arrival is forecast.

Today
17 Aug
1
Unlikely
Tomorrow
18 Aug
2
Possible
Wed
19 Aug
2
Possible
Thu
20 Aug
2
Possible
Fri
21 Aug
2
Possible
Sat
22 Aug
2
Possible
Sun
23 Aug
2
Possible

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

auroratonight.space

What Kp is needed here?

Þórsmörk sits at a magnetic latitude of approximately 64°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 2 before the auroral oval expands far enough south to be visible from here.

At Kp 2, visibility is possible from Þórsmörk but skies need to be clear and dark. Cloud cover and light pollution remain the main obstacles even when Kp is high enough.

Plan your viewing

Best dark sky sites near Þórsmörk

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

Þórsmörk valley floor

Get directions ↗
Bortle Class 1 - Exceptional dark sky 150 km from Reykjavik - approximately 3 hours by Highland bus or 4WD

The valley floor is surrounded on three sides by glacier tongues from Eyjafjallajökull, Mýrdalsjökull, and Tindfjallajökull. No permanent settlements, no artificial light of any kind. The black sand and glacial river sediment floor of the valley gives an extraordinary foreground - pale ice glowing under aurora while the glacier walls rise on both sides. One of Iceland's most genuinely isolated dark sky positions accessible without specialist mountaineering equipment.

Valahnúkur viewpoint

Get directions ↗
Bortle Class 1 - Exceptional dark sky 150 km from Reykjavik - 45 minute hike from valley huts plus Highland bus journey

A short but steep hike above the Þórsmörk valley floor gives 360° views of all three glacier systems and the black sand valleys below. At around 300 m above the valley, the viewpoint is above any ground mist and gives unobstructed sky in all directions. Aurora from here shows the full panorama - glacier tongues lit green, river beds silver, and the sky active overhead. A key position for astrophotography in Iceland's Highland zone.

Stakkholtsgjá canyon entrance

Get directions ↗
Bortle Class 1 - Exceptional dark sky 150 km from Reykjavik - short walk from Þórsmörk hut area

The entrance to a narrow canyon cut through volcanic rock by glacial meltwater. The canyon walls rise 30 m above the river and the entrance faces the open valley sky to the west. A small waterfall at the back of the canyon adds a water element. The dark basalt walls and the clear sky visible from the canyon entrance create a distinctive framing for aurora - different in character from the open glacier views but equally dramatic.

When to go

Best time to see the northern lights in Þórsmörk

At 64°N magnetic latitude, Þórsmörk has one of the longest aurora seasons in the world. Meaningful darkness returns in late August and displays are possible on almost any clear night from September through March. Only the endless daylight of May, June, and July rules out viewing completely.

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 Þórsmörk's latitude.

May through July is effectively impossible for aurora viewing: the midnight sun keeps the sky bright around the clock at this latitude. No storm level, not even G5, can produce a visible display without astronomical darkness.

Up to 8 locations

Þórsmörk

Iceland

Low chance
Kp 1 need Kp 2
Checking darkness…
Vík

Iceland

Low chance
Kp 1 need Kp 2
Checking darkness…
Landmannalaugar

Iceland

Low chance
Kp 1 need Kp 2
Checking darkness…
The odds

How often does the aurora appear in Þórsmörk?

Average nights per month the Kp reached Þórsmörk's threshold of 2+, from 15 years of geomagnetic data (2010–2024).

22.5Jan
23.3Feb
26Mar
10Apr
0May
0Jun
0Jul
0.9Aug
24.8Sep
23.8Oct
21Nov
21.1Dec

Counts the Kp 2+ threshold only - cloud cover and local darkness are not included.
Kp data: GFZ German Research Centre for Geosciences, CC BY 4.0

Make it happen

Plan your trip to Þórsmörk

Based on 15 years of geomagnetic data (2010–2024)

1st
March
26.0
avg aurora nights
Stay 1+ nights for 80% chance
2nd
September
24.8
avg aurora nights
Stay 1+ nights for 80% chance
3rd
October
23.8
avg aurora nights
Stay 2+ nights for 80% chance

Best window

The January to March window averages 72 aurora nights - the strongest consecutive stretch of the year.

How long to stay

For your best chance in March, plan at least 1 night.

Questions

Common questions about aurora in Þórsmörk

Can you visit Þórsmörk in winter for aurora?
No. The Highland roads (F-roads) that access Þórsmörk close in October and do not reopen until late May or June when snow melts and river levels allow crossing. Winter access is not possible by road - the river crossings that 4WDs use in summer are impassable under ice and flood conditions. The aurora season at this latitude peaks in September-October and March-April; only the autumn shoulder before road closure and the very early spring are viable. Plan for September or early October.
How do I get to Þórsmörk?
Two options: the Reykjavik Excursions highland bus (Þórsmörk direct service, seasonal), or a high-clearance 4WD vehicle with river crossing capability. The road involves several unbridged glacial river crossings that require genuine 4WD and should not be attempted in a standard car or small SUV. The Reykjavik Excursions service departs Reykjavik in the morning and returns in the evening - it does not stay overnight. For aurora photography, the bus timing is impractical; a 4WD and overnight stay at the Húsadalur huts is the only option.
What Kp is needed for aurora in Þórsmörk?
Kp 3 is sufficient - the same threshold as the south Iceland lowlands. The darkness of Þórsmörk (Bortle Class 1) makes even a faint Kp 3 display dramatically visible compared to the same activity level at a lit location. At Kp 3 the aurora is typically a visible arc or band across the northern sky; at Kp 4+ it becomes active with visible movement. The extreme darkness amplifies relatively modest geomagnetic events.
Is Þórsmörk better than Jökulsárlón for aurora?
Different strengths. Jökulsárlón has the glacier lagoon and floating icebergs as a foreground - unique and consistently spectacular. Þórsmörk is darker and completely isolated, with three glaciers and a black sand valley creating a more immersive wilderness environment. Jökulsárlón is easily accessible year-round; Þórsmörk requires 4WD and is only available September-October. Both are exceptional. For the most remote, least visited experience, Þórsmörk wins. For accessibility and the iconic floating iceberg shot, Jökulsárlón wins.
Can I combine Þórsmörk with Landmannalaugar?
The Laugavegur trail connects the two across 55 km of Highland terrain. In good conditions it takes 3-5 days on foot. Both are within the Highland zone and share the F-road access season (roughly late June to early October). Combining both in a single Highland trip is practical for hikers; a vehicle-based combined visit requires driving separate routes (Þórsmörk from the south, Landmannalaugar from the north via Hella). They are not directly connected by road.
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