Aurora Borealis in Karhula

Finland · 60.52°, 26.93° · geomagnetic 57.7° · needs Kp 7

Tonight's aurora forecast for Karhula

22%

Peak chance of a visible display tonight, from the same model the Revon app runs. Karhula needs Kp 7 to see anything at all, and tonight the forecast peaks at Kp 4.7. Short of the threshold, which is what most nights look like here.

Tonight Tue 08 Sep
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Get the full 30-night forecast in Revon

Updated 2026-09-08 10:35 UTC

Local aurora guide for Karhula

Karhula is located at 57.7° geomagnetic latitude. Auroras visible at this latitude typically require a Kp index of 7 or higher.

On average, there are about 2.3 nights per year in Karhula where the conditions are suitable for aurora viewing.

The period between 2016 and 2026 has been analyzed for these potential viewing opportunities.

The darkest months in Karhula are May, June, July, and August. During these months, full darkness is not achieved.

The best months for aurora viewing align with the darker periods outside of the summer months. These are typically September, November, and March.

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

Areas with darker skies, such as Bortle 4, can be found 31 km north-east near Hamina. Bortle 5 skies are available 18 km east near Hamina.

Local terrain features include hills like Alhonvuori and Mansikkavuori, islands such as Jäppilänsaari and Myllykallio, and the headland Pitkäniemi.

Alhonvuori is a hill located 3.7 km north-west of Karhula.

Mansikkavuori, another hill, is situated 3.7 km east-north-east of Karhula.

Jäppilänsaari and Myllykallio are islands located 4.3 km north-west of Karhula. Pitkäniemi is a headland 4.6 km east-north-east of Karhula.

Between 2015 and 2016, 40 verified aurora reports were recorded within 300 km of Karhula.

Analysis of geomagnetic data indicates potential viewing opportunities on several nights between 2025 and 2026.

These qualifying nights include March 20, 2026 (Kp 7.0), January 20, 2026 (Kp 7.67), January 19, 2026 (Kp 8.67), November 12, 2025 (Kp 7.33), and November 11, 2025 (Kp 8.67).

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 Karhula 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 Karhula.