Aurora Borealis in Joensuu

Finland · 62.60°, 29.76° · geomagnetic 59.3° · needs Kp 5

Tonight's aurora forecast for Joensuu

12%

Peak chance of a visible display tonight, from the same model the Revon app runs. Joensuu needs Kp 5 to see anything at all, and tonight the forecast peaks at Kp 3.3. Short of the threshold, which is what most nights look like here.

Tonight Sun 09 Aug
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Get the full 30-night forecast in Revon

Updated 2026-08-09 18:23 UTC

Local aurora guide for Joensuu

Joensuu is located at 59.3° geomagnetic latitude. Auroras are typically visible when the planetary Kp index reaches 5.

On average, there are 19.2 nights per year in Joensuu where conditions are suitable for aurora viewing.

The record span for these observations is from April 2, 2016, to March 30, 2026.

The best months for aurora viewing in Joensuu are September, March, and October.

During April, May, June, July, and August, there is no full darkness, which can impact viewing conditions.

Joensuu experiences a Bortle 7 sky, indicating significant light pollution.

Darker skies, Bortle 4, can be found 17 km north near Kontiolahti.

Areas with Bortle 5 skies are located 17 km south-east of Joensuu. Nearby islands include Selkäsaari and Issakka, and headlands such as Nuottaniemi and Kallioniemi are to the west. Kokkovaara ridge is to the north.

Geographic features near Joensuu include the island of Selkäsaari, located 3.2 km to the west, and Issakka island, 3.5 km to the east.

Headlands such as Nuottaniemi (3.7 km west-north-west) and Kallioniemi (4.3 km west-north-west) offer varied perspectives.

To the north, the Kokkovaara ridge is situated 4.3 km away.

There have been 138 verified aurora reports within 300 km of Joensuu between January 1, 2015, and December 31, 2016.

The period from 2016 to 2026 has recorded several nights with significant geomagnetic activity.

Notable qualifying nights include March 20, 2026 (Kp 7.0), March 21, 2026 (Kp 6.0), March 22, 2026 (Kp 6.67), March 23, 2026 (Kp 5.0), and March 24, 2026 (Kp 5.0).

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

Know when it is worth going outside

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

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Nearby towns

Forecasts for places within reach of Joensuu.