Aurora Borealis in Sønderborg

Denmark · 54.91°, 9.79° · geomagnetic 55.0° · needs Kp 7

Tonight in Sønderborg

15%

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 5.7. Short of the threshold, which is what most nights look like here.

Tonight Sun 02 Aug
15%
18
20
22
00
02
04
06
Tomorrow Mon 3 Aug
2%
Hour-by-hour for this night is in the app
Tuesday Tue 4 Aug
2%
Hour-by-hour for this night is in the app

Unlock every hour in the app

Updated 2026-08-02 20:20 UTC

The next 30 nights in Sønderborg

Every night to come, scored the same way as tonight. The best of the open week is Sunday 2 Aug at 15%. Not one of the seven reaches the Kp 7 that Sønderborg needs, which is normal rather than unlucky — it averages 2.6 viable nights a year. The 23 nights past the seven-day window move with the 27-day solar rotation and are updated daily in the app.

Quiet geomagnetic conditions ahead. No significant aurora activity expected this month.

Sun 2
15%
Kp 5.7
Mon 3
2%
Kp 3.3
Tue 4
2%
Kp 1.9
Wed 5
2%
Kp 3.0
Thu 6
2%
Kp 3.0
Fri 7
2%
Kp 2.0
Sat 8
2%
Kp 2.0

Nights 8–30 unlock in the Revon app

See all 30 nights for Sønderborg

Revon aurora model over the NOAA Kp forecast and 27-day outlook

How often the aurora borealis reaches Sønderborg

2.6 nights a year, averaged across 10.0 years of records

Storm levelNights / year
Kp 483.4
Kp 528.7
Kp 69.3
Kp 73.2
Kp 81.2

NOAA planetary Kp, 2016-04-02 to 2026-03-30

Wait for an alert; do not book a week

At Kp 7, Sønderborg needs a severe geomagnetic storm before anything shows above the northern horizon. Storms that size arrive a handful of times per solar cycle and announce themselves a day or two ahead. Watching for one beats picking dates and hoping.

Hours of true darkness, month by month

JanFebMarAprMayJunJulAugSepOctNovDec
11.810.38.25.10.00.00.03.57.29.711.412.2

Solar declination and hour angle at −18°

Nothing to see from May to July

Through those months the sun never falls more than 18° below the Sønderborg horizon, so the sky never darkens fully. Plan around the darker half of the year.

Getting clear of the light

Sønderborg is small enough that its own lights are a minor problem — the centre reads Bortle 3. Walking to the edge of town is often escape enough.

Falchi 2016 World Atlas (DOI: 10.5880/GFZ.1.4.2016.001)

The months that actually deliver

Counting only nights that were both stormy enough and dark enough, September, August and November came out ahead in Sønderborg. That is storm season and darkness overlapping — the equinoxes tend to be geomagnetically active, and the nights are already long by then.

Darkest nights of the coming year

A bright moon washes out a weak display as effectively as street lighting. These new moons fall inside the Sønderborg viewing season.

Where it is close to a certainty

If you would rather plan a trip than wait for a storm, the nearest place with genuinely frequent aurora is Inverness, 911 km west-north-west in United Kingdom.

SønderborgInverness
Kp needed75
Nights per year2.6 28.7
Geomagnetic latitude55.0° 59.8°

See the Inverness forecast

Confirmed reports from this area

6 verified sightings were logged within 300 km of Sønderborg between 2015-01-01 and 2016-12-31. Rare is not the same as impossible.

Aurorasaurus verified positive reports

Where the horizon opens up near Sønderborg

The display sits low on the northern horizon, so what beats a better forecast is open ground facing that way. Height gets you above the town glow; water gives you an unbroken skyline. These are within a short drive of Sønderborg.

Places from GeoNames (CC BY 4.0)

What to do with the daylight

Aurora watching is a night job, and in winter that leaves a short, bright day to fill. Close to Sønderborg you will find Ragebøl Radio Mast, Nydam Mose and Felsted Radio Mast.

Keep the daylight loose: the sky decides the evening, and the forecast can turn within a few hours.

Places from GeoNames (CC BY 4.0)

Where to stay

Anywhere on the outskirts of Sønderborg will do; what matters is being able to step outside and check the sky without a drive first.

Places from GeoNames (CC BY 4.0) — confirm before booking

The last nights it was visible here

Nights in the last decade when the storm was strong enough for Sønderborg and the sky was dark enough to show it.

DatePeak
2026-03-20Kp 7.0
2026-01-20Kp 7.67
2026-01-19Kp 8.67
2025-11-12Kp 7.33
2025-11-11Kp 8.67

NOAA planetary Kp

Know when it is worth going outside

Revon watches the Sønderborg forecast and pushes an alert when the odds for tonight clear your threshold — no checking, no guessing.

Get aurora alerts on iPhone

Common questions about the aurora borealis in Sønderborg

Can you see the aurora borealis from Sønderborg?

Yes. On the last 10.0 years of NOAA Kp records, Sønderborg had about 2.6 nights a year when the storm was strong enough and the sky dark enough at the same time.

What Kp index do you need to see the aurora borealis in Sønderborg?

Kp 7. Sønderborg sits at geomagnetic latitude 55.0°, and the auroral oval only reaches that far from the pole once activity hits Kp 7. Storms that size occur about 3.2 nights a year.

When is the best time of year to see the aurora borealis in Sønderborg?

September, August and November. Those months scored highest once both conditions are counted together: geomagnetic activity and enough hours of real darkness. From May to July the sky over Sønderborg never gets fully dark, so nothing is visible however strong the storm.

Where can you escape the light pollution near Sønderborg?

The centre of Sønderborg reads Bortle 3. The nearest sky at Bortle 3 is about 10 km north-north-west. On a marginal night that drive matters more than the forecast does.

Where is the nearest place to Sønderborg with reliable aurora borealis?

Inverness, United Kingdom — 911 km west-north-west. It needs only Kp 5 and averages 28.7 viable nights a year against 2.6 in Sønderborg.

Nearby towns

Forecasts for places within reach of Sønderborg.