Live aurora forecast

Northern lights in Sommarøy tonight

Tromsø municipality, Northern Norway · 69° magnetic latitude · Kp 1–2 threshold

Aurora visibility · Sommarøy
1/9
Possible tonight

Kp 1 is at the threshold for Sommarøy. Aurora may be visible from a dark site if cloud cover permits.

QuietStormExtreme
Threshold
Kp 1–2
Magnetic latitude
~69°N
Bz ↓ south
- nT
Solar wind
- km/s
Density
- p/cm³
Cloud
-
Conditions right now: - Kp + Bz + solar wind + cloud + moon

Updated: 20 Jul, 12:58 UTC

7-day outlook for Sommarøy

Today
20 Jul
1
Possible
Tomorrow
21 Jul
3
Good chance
Wed
22 Jul
3
Good chance
Thu
23 Jul
3
Good chance
Fri
24 Jul
3
Good chance
Sat
25 Jul
3
Good chance
Sun
26 Jul
3
Good chance

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

auroratonight.space

What Kp is needed here?

Sommarøy sits at a magnetic latitude of approximately 69°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 1–2 before the auroral oval expands far enough south to be visible from here.

At Kp 1–2, visibility is possible from Sommarøy 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 Sommarøy

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

Sommarøy west beach

Get directions ↗
Bortle Class 2 - Excellent dark sky 1 km from Sommarøy village - approximately 15 minute walk to the western headland

The west-facing beach on Sommarøy gives an open Polar Ocean horizon with no settlement to the north or west. Road lighting ends at the village and the beach itself is unlit. Bortle Class 2 from the beach. Aurora appears above the dark water to the north and northwest. The white sand - unusual in Arctic Norway - gives a reflective foreground surface when snow is absent. The beach is accessible year-round via the sealed road from the bridge. In calm conditions the sea surface gives aurora reflections. No facilities at night; bring appropriate clothing, as the exposed western coast is colder than sheltered positions inland.

Hillesøya north coast

Get directions ↗
Bortle Class 2 - Excellent dark sky 5 km north of Sommarøy village - approximately 10 minute drive across the bridge to Hillesøya

Hillesøya is connected to Sommarøy by a short road bridge. The northern coastline faces directly over the Polar Ocean with no further land to the north before Svalbard. Bortle Class 2. The headland positions give a clean northern horizon at sea level. In calm conditions the fjord surface provides aurora reflections. Less visited than the main Sommarøy beach - the road across Hillesøya reduces to single track and ends at the coast. A practical extension from a Sommarøy base for those with a hire car and time to explore the outer island.

Rebbenesøya island

Get directions ↗
Bortle Class 1-2 - Exceptional dark sky 15 km northwest of Sommarøy - approximately 25 minute drive via Hillesøya and the Rebbenesøy bridge

Rebbenesøya is reached via Hillesøya across a second bridge and is the outermost island in the chain west of Tromsø. It has the least light pollution of any easily accessible position in the area. Bortle Class 1-2. The island has a small permanent population and the road ends at the north coast. From the northern shore the horizon is fully open over the Polar Ocean. On nights when Tromsø city centre shows a faint aurora arc, Rebbenesøya gives the full display with no competing light from the city. The extra 15 km from Sommarøy takes around 25 minutes and represents a meaningful improvement in sky darkness over an already-dark baseline.

When to go

Best time to see the northern lights in Sommarøy

At 69°N magnetic latitude, Sommarøy 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 Sommarøy'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

Sommarøy

Norway

Possible
Kp 1 need Kp 1-2
Checking darkness…
Tromsø

Norway

Possible
Kp 1 need Kp 1-2
Checking darkness…
Kvaløya

Norway

Possible
Kp 1 need Kp 1
Checking darkness…
The odds

How often does the aurora appear in Sommarøy?

Average nights per month the Kp reached Sommarøy's threshold of 1+, from 15 years of geomagnetic data (2010–2024).

24.8Jan
27.3Feb
28.6Mar
0Apr
0May
0Jun
0Jul
0Aug
16.4Sep
31.1Oct
25Nov
22.6Dec

Counts the Kp 1+ 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 Sommarøy

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

1st
October
31.1
avg aurora nights
Requires an extended stay
2nd
March
28.6
avg aurora nights
Stay 1+ nights for 80% chance
3rd
February
27.3
avg aurora nights
Stay 1+ nights for 80% chance

Best window

The January to March window averages 81 aurora nights - the strongest consecutive stretch of the year.

How long to stay

Aurora at this latitude requires patience - allow as many nights as possible during October.

Questions

Common questions about aurora in Sommarøy

What makes Sommarøy a better aurora position than Tromsø city?
Tromsø city centre has significant light pollution from street lighting, buildings, and the university campus. Aurora visible from the city centre is typically already Kp 2-3 or higher. Sommarøy is 36 km west of Tromsø by road, sits at 69°N magnetic latitude, and has Bortle Class 2 sky from the beach and headland positions. At Kp 1-2, faint aurora that is difficult to distinguish from Tromsø city appears clearly above the open water to the north. The drive is 40 minutes from Tromsø - a practical improvement for any planned aurora outing that does not require staying in the city.
What Kp is needed for aurora at Sommarøy?
Kp 1–2 from the west beach and Hillesøya headland positions. The Kp index measures global geomagnetic activity on a 0-9 scale, updated every 3 hours. At 69°N magnetic latitude, Kp 1 can produce a faint arc on a clear night from a dark position. Kp 2 gives a structured display visible to the north and overhead. Kp 3+ produces movement and colour across the sky. The island has no significant artificial light to the north, so low-level activity registers more clearly than from Tromsø city.
How do I get to Sommarøy from Tromsø?
Take the Rv658 west from Tromsø across Tromsøya and Kvaløya, then follow the road to Sommarøy. The total drive is approximately 36 km and takes 40 minutes. The road is sealed and maintained year-round including winter. A hire car is needed - there is no late-night bus service to Sommarøy. The island bridge is passable in all weather conditions except the most severe winter storms. Parking is available near the beach and at the village centre.
When is aurora season at Sommarøy?
October to April. Sommarøy experiences the midnight sun from late May to mid-July, during which the sky is never dark enough for aurora. Darkness returns in late July but the aurora window opens reliably from late September. December and January give the longest periods of darkness, with civil twilight ending around 2pm and not returning until 10am. March is often recommended as a practical compromise: genuine darkness for 8-10 hours, statistically higher geomagnetic activity around the spring equinox, and marginally better settled weather than midwinter.
Is Sommarøy suitable for aurora photography?
Yes. The white sand beach and open water foreground are unusual in an Arctic aurora location. Reflections appear on calm sea and fjord surfaces. The island is low-lying and lacks the dramatic mountain silhouettes found in Lofoten and the Lyngen Alps - the main photographic elements are the sea horizon, the beach, and the boat jetties in the village. A wide-angle lens between 14 mm and 24 mm covers most positions. Long exposures of 15-25 seconds at ISO 1600-3200 and f/2.8 or wider suit most aurora brightness levels from this site.
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