Aurora Borealis in Lieto

Finland · 60.51°, 22.46° · geomagnetic 58.4° · needs Kp 5

Tonight's aurora forecast for Lieto

44%

Peak chance of a visible display tonight, from the same model the Revon app runs. Lieto 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
44%
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06

Get the full 30-night forecast in Revon

Updated 2026-09-08 10:35 UTC

Local aurora guide for Lieto

Lieto is located at 58.4° geomagnetic latitude. Auroras are typically visible when the planetary Kp index reaches 5 or higher.

With an average of 20.6 viable nights per year, patient observers may have opportunities to witness auroral activity.

These odds are based on data spanning from 2016 to 2026.

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

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

Lieto experiences a Bortle 7 light pollution level. Areas with less light pollution include Mynämäki, which is Bortle 4, and Pöytyä, which is Bortle 5.

Nearby terrain features that may affect the horizon include hills like Kärmekallio and Suitonmäki, and reserves such as Nautelankosken Luonnonsuojelualue.

Geographic features near Lieto that may offer viewing opportunities include Kärmekallio, a hill located 3.2 km west-north-west, and Suitonmäki, a hill 3.8 km east.

Further afield, the Nautelankosken Luonnonsuojelualue reserve is 5.1 km north, Pitkänkuononnokka headland is 15.8 km north-west, and Kurjenrahkan Kansallispuisto reserve is 25.0 km north.

Between 2015 and 2016, there were 62 verified aurora reports within 300 km of Lieto.

The historical data includes qualifying nights with Kp values of 5.0 or higher, such as March 24, 2026, and March 23, 2026.

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 Lieto 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 Lieto.