Aurora Borealis in Sønderborg
Denmark · 54.91°, 9.79° · geomagnetic 55.0° · needs Kp 7
Tonight's aurora forecast for Sønderborg
4%
Peak chance of a visible display tonight, from the same model the Revon app runs. Sønderborg needs Kp 7 to see anything at all, and tonight the forecast peaks at Kp 4.8. Short of the threshold, which is what most nights look like here.
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Updated 2026-09-08 10:35 UTC
Local aurora guide for Sønderborg
Sønderborg is located at 55.0° geomagnetic latitude. Auroras are typically visible at this latitude during periods of strong geomagnetic activity, specifically when the Kp index reaches 7 or higher.
Historically, there have been approximately 2.6 nights per year with conditions suitable for aurora viewing in this region. This is based on data spanning from April 2, 2016, to March 30, 2026.
The best months for aurora viewing in Sønderborg are September, August, and November. During these months, there is sufficient darkness for potential sightings.
Conversely, May, June, and July experience periods without full darkness, which can make aurora viewing more challenging.
Sønderborg has a Bortle scale rating of 3, indicating a dark sky environment. Areas with similar low light pollution are found up to 10 km north-north-west of the town.
The local horizon features include hills, bays, cliffs, and islands. Notable features include Lambjerg hill to the east, Augustenborg Fjord to the north-east, and Katholm island to the north-north-east.
The landscape around Sønderborg includes hills such as Lambjerg, located 5.9 km east. Bays like Augustenborg Fjord and Sebbelev Nor are situated to the north-east.
Cliffs are present at Lambjerg Indtægt, 6.2 km east, and islands like Katholm are found 7.5 km north-north-east of Sønderborg.
Between January 1, 2015, and December 31, 2016, there were 6 verified aurora reports within 300 km of Sønderborg.
The historical data includes several nights with significant geomagnetic activity. Qualifying nights within the record span include March 20, 2026 (Kp 7.0), January 20, 2026 (Kp 7.67), January 19, 2026 (Kp 8.67), November 12, 2025 (Kp 7.33), and November 11, 2025 (Kp 8.67).
Sources: Revon location dataset · Revon analysis of NOAA planetary Kp · Solar declination and hour-angle calculation · Falchi 2016 World Atlas of artificial night sky brightness · GeoNames (CC BY 4.0) · Aurorasaurus verified positive reports
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