Aurora Borealis in Iisalmi

Finland · 63.56°, 27.19° · geomagnetic 60.6° · needs Kp 5

Tonight's aurora forecast for Iisalmi

48%

Peak chance of a visible display tonight, from the same model the Revon app runs. Iisalmi needs Kp 5 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
48%
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Get the full 30-night forecast in Revon

Updated 2026-09-08 10:35 UTC

Local aurora guide for Iisalmi

Iisalmi is located at 60.6° geomagnetic latitude. Auroras are typically visible when the planetary geomagnetic activity reaches Kp 5.

With an average of 18.9 viable nights per year, patient observers have a chance to witness auroras.

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

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

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

The area around Iisalmi experiences Bortle 5 light pollution. Nearby areas offer darker skies.

A Bortle 4 zone is located 17 km east-south-east near Lapinlahti.

A Bortle 5 zone is located 7 km south-south-east near Iisalmi.

Karhumäki, a hill located 3.0 km west-north-west of Iisalmi, offers a viewpoint.

Lypsyniemi, a headland 3.3 km east-north-east of Iisalmi, is another potential location.

Koiraniemi, a headland 3.4 km north-north-west of Iisalmi, and Poskimäki, a hill 3.4 km north-north-east of Iisalmi, are also noted features. Naulalampi, a lake 3.7 km north-north-west of Iisalmi, is also nearby.

There have been 151 verified aurora reports within 300 km of Iisalmi between January 1, 2015, and December 31, 2016.

The data indicates an average of 18.9 viable nights per year for aurora viewing.

Notable qualifying nights include March 20-24, 2026, with Kp values ranging from 5.0 to 7.0.

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 Iisalmi 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 Iisalmi.