Aurora Borealis in Loimaa

Finland · 60.85°, 23.06° · geomagnetic 58.6° · needs Kp 5

Tonight's aurora forecast for Loimaa

44%

Peak chance of a visible display tonight, from the same model the Revon app runs. Loimaa 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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Get the full 30-night forecast in Revon

Updated 2026-09-08 10:35 UTC

Local aurora guide for Loimaa

Loimaa is at 58.6° geomagnetic latitude. Auroras are typically visible here when the planetary Kp index reaches 5.

On average, there are 20.4 nights per year suitable for aurora viewing in this region. These opportunities have been recorded between 2016 and 2026.

The best months for aurora viewing in Loimaa are September, March, and October. These months offer a good balance of darkness and potential aurora activity.

During May, June, July, and August, there is insufficient darkness for aurora viewing.

Loimaa experiences a Bortle 6 sky. Areas near Humppila to the north-north-east and Ypäjä to the south-east offer darker skies, rated Bortle 4 and Bortle 5 respectively.

Notable terrain features include hills like Koivukallio and Kidunkallio to the north and north-west of Loimaa. Lakes such as Äijälammi and Mykyrilammi are located to the east, while Isosaari island is to the north-east.

There are 40 verified aurora reports within 300 km of Loimaa between January 2015 and December 2016.

Recent qualifying nights with Kp 5.0 or higher occurred on March 20, 21, 22, 23, and 24, 2026.

Sources: 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 Loimaa 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 Loimaa.