Northern lights Þórsmörk tonight
Þórsmörk sits at ~64°N magnetic latitude - Kp 3 is sufficient. The glacial valley surrounded by three glacier systems is one of Iceland's darkest locations with Bortle Class 1 sky. Access requires a 4WD or the Highland bus - F-roads are open late June to October only. Best aurora window: September and early October.
Aurora visibility - Þórsmörk
Unlikely tonight
Kp 1 is well below the Kp 3 threshold needed for aurora to be visible from Þórsmörk.
Current Kp
1
of 9
7-day outlook for Þórsmörk
Today
19 May
Tomorrow
20 May
Thu
21 May
Fri
22 May
Sat
23 May
Sun
24 May
Mon
25 May
Based on CME arrival predictions from NASA DONKI. Arrival times ±6 hours.
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 3 before the auroral oval expands far enough south to be visible from here.
At Kp 3, 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.
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 ↗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 ↗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 ↗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.
Best time to see the northern lights in Þórsmörk
Þórsmörk'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.
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.
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.
Related pages
Northern Lights Iceland
Iceland-wide aurora forecast hub.
Northern Lights Vík Tonight
Vík - Reynisfjara beach on the accessible south coast.
Northern Lights Landmannalaugar Tonight
Landmannalaugar - rhyolite mountains, Highland access only.
Northern Lights Jökulsárlón Tonight
Jökulsárlón - glacial lagoon, south coast year-round access.
What Is the Kp Index?
What Kp 3 means for viewing at 64°N magnetic latitude.
Common questions
Aurora at Þórsmörk - Highland access, 4WD requirement, and glacier scenery.
