Aurora Borealis in Viikki
Finland · 60.22°, 25.02° · geomagnetic 57.7° · needs Kp 7
Tonight in Viikki
38%
Peak chance of a visible display tonight, from the same model the Revon app runs. Viikki 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.
Updated 2026-08-02 20:20 UTC
The next 30 nights in Viikki
Every night to come, scored the same way as tonight. The best of the open week is Sunday 2 Aug at 38%. Not one of the seven reaches the Kp 7 that Viikki needs, which is normal rather than unlucky — it averages 2.3 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.
Nights 8–30 unlock in the Revon app
Revon aurora model over the NOAA Kp forecast and 27-day outlook
How often the aurora borealis reaches Viikki
2.3 nights a year, averaged across 10.0 years of records
| Storm level | Nights / year |
|---|---|
| Kp 4 | 83.4 |
| Kp 5 | 28.7 |
| Kp 6 | 9.3 |
| Kp 7 | 3.2 |
| Kp 8 | 1.2 |
NOAA planetary Kp, 2016-04-02 to 2026-03-30
Wait for an alert; do not book a week
At Kp 7, Viikki 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
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 12.1 | 10.2 | 7.6 | 3.0 | 0.0 | 0.0 | 0.0 | 0.0 | 6.2 | 9.4 | 11.6 | 12.6 |
Solar declination and hour angle at −18°
Nothing to see from May to August
Through those months the sun never falls more than 18° below the Viikki horizon, so the sky never darkens fully. Plan around the darker half of the year.
Getting clear of the light
Viikki is small enough that its own lights are a minor problem — the centre reads Bortle 8. Walking to the edge of town is often escape enough.
- 36 km south-east — around Porvoo → Bortle 5
- 47 km east-south-east — around Porvoo → Bortle 4
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, November and March came out ahead in Viikki. 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 Viikki viewing season.
- 11 Sep 2026
- 11 Oct 2026
- 09 Nov 2026
- 09 Dec 2026
- 07 Jan 2027
- 06 Feb 2027
- 08 Mar 2027
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 Rovaniemi, 699 km north in Finland.
| Viikki | Rovaniemi | |
|---|---|---|
| Kp needed | 7 | 3 |
| Nights per year | 2.3 | 171.4 |
| Geomagnetic latitude | 57.7° | 63.6° |
Confirmed reports from this area
40 verified sightings were logged within 300 km of Viikki 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 Viikki
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 Viikki.
- Spikberget — hill5.2 km east-north-east
- Råbacka — hill5.5 km east-north-east
- Heureka — observatory7.3 km north
- Pilslätt — park7.6 km west-north-west
- Kråkholmen — island9.1 km east
- Storträsk — lake9.3 km north-east
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. Viikki keeps its fortified past above ground, at Sibbesborg, Pasilan linkkitorni and Suomenlinna, and for a day when the cloud sits low, Viikin Latokartano, Vanda Stadsmuseum and Nissbackan Kartano are indoors and near by.
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 Viikki will do; what matters is being able to step outside and check the sky without a drive first.
- Comfort Hotel Pilotti 7.7 km from the centre
- Sokos 7.7 km from the centre
- Sokos Vantaa Airport 7.7 km from the centre
- Best Western Pilotti 7.7 km from the centre
- Best Western Airport Hotel Pilotti 7.7 km from the centre
- Original Sokos Vantaa 7.7 km from the centre
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 Viikki and the sky was dark enough to show it.
| Date | Peak |
|---|---|
| 2026-03-20 | Kp 7.0 |
| 2026-01-20 | Kp 7.67 |
| 2026-01-19 | Kp 8.67 |
| 2025-11-12 | Kp 7.33 |
| 2025-11-11 | Kp 8.67 |
NOAA planetary Kp
Know when it is worth going outside
Revon watches the Viikki forecast and pushes an alert when the odds for tonight clear your threshold — no checking, no guessing.
Common questions about the aurora borealis in Viikki
Can you see the aurora borealis from Viikki?
Yes. On the last 10.0 years of NOAA Kp records, Viikki had about 2.3 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 Viikki?
Kp 7. Viikki sits at geomagnetic latitude 57.7°, 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 Viikki?
September, November and March. Those months scored highest once both conditions are counted together: geomagnetic activity and enough hours of real darkness. From May to August the sky over Viikki never gets fully dark, so nothing is visible however strong the storm.
Where can you escape the light pollution near Viikki?
The centre of Viikki reads Bortle 8. The nearest sky at Bortle 4 is about 47 km east-south-east around Porvoo. On a marginal night that drive matters more than the forecast does.
Where is the nearest place to Viikki with reliable aurora borealis?
Rovaniemi, Finland — 699 km north. It needs only Kp 3 and averages 171.4 viable nights a year against 2.3 in Viikki.
Nearby towns
Forecasts for places within reach of Viikki.