Northern lights Sommarøy tonight
Sommarøy sits at ~69°N magnetic latitude on an island 36 km west of Tromsø. Kp 1–2 is the threshold. The west beach and Hillesøya headland give an open Polar Ocean horizon with Bortle Class 2 sky - substantially darker than Tromsø city for the same 40-minute drive. The outer island of Rebbenesøya, reached via a second bridge, gives Bortle Class 1-2 conditions. Best season: October to April.
Aurora visibility - Sommarøy
Possible tonight
Kp 1 is at the threshold for Sommarøy. Aurora may be visible from a dark site if cloud cover permits.
Current Kp
1
of 9
7-day outlook for Sommarøy
Today
3 Jun
Tomorrow
4 Jun
Fri
5 Jun
Sat
6 Jun
Sun
7 Jun
Mon
8 Jun
Tue
9 Jun
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.
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 ↗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 ↗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 ↗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.
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.
How often does aurora appear in Sommarøy?
Average nights per month when Kp reaches 1+ - based on 15 years of data
Best month
October
Average aurora nights per year
176
Kp threshold
1+
Based on 15 years of geomagnetic data (2010-2024). Shows nights when Kp reached 1+ at any point in the day - cloud cover and local darkness not included. Months with no astronomical darkness show zero.
Kp data: GFZ German Research Centre for Geosciences, CC BY 4.0
Plan your trip to Sommarøy
Based on 15 years of geomagnetic data
October
31.1
avg aurora nights
Requires an extended stay
March
28.6
avg aurora nights
Stay 1+ nights for 80% chance
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.
Related pages
Northern Lights Norway
Norway-wide aurora forecast and location hub.
Northern Lights Tromsø Tonight
Tromsø - the aurora capital of Norway, 36 km east.
Northern Lights Kvaløya Tonight
Kvaløya - island west of Tromsø with Bortle Class 2 sky.
Northern Lights Senja Tonight
Senja - dramatic coastline and fjords south of Tromsø.
Northern Lights in Norway Guide
Complete guide to seeing the northern lights in Norway.
What Is the Kp Index?
Why Kp 1 is enough at 69°N magnetic latitude.
Common questions
Aurora watching at Sommarøy - comparing it to Tromsø city and using the outer islands.