Aurora Borealis in Lempäälä
Finland · 61.32°, 23.75° · geomagnetic 59.0° · needs Kp 5
Tonight's aurora forecast for Lempäälä
42%
Peak chance of a visible display tonight, from the same model the Revon app runs. Lempäälä 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.
Get the full 30-night forecast in Revon
Updated 2026-09-08 10:35 UTC
Local aurora guide for Lempäälä
Lempäälä is located at 59.0° geomagnetic latitude. Auroras are typically visible here when the planetary Kp index reaches 5 or higher.
On average, there are about 20.1 nights per year with conditions suitable for aurora viewing. These opportunities have been recorded between April 2, 2016, and March 30, 2026.
The best months for aurora viewing in Lempäälä are September, March, and October. During these months, the nights are long enough for potential aurora displays.
From May through August, Lempäälä experiences periods without full darkness, which can make aurora viewing more challenging.
Lempäälä has a Bortle scale rating of 7, indicating significant light pollution. Areas with darker skies can be found nearby.
A Bortle 4 sky is located 44 km south-west near Humppila. A Bortle 5 sky is 28 km east-south-east near Valkeakoski.
Local terrain features include hills, islands, and headlands, such as Saarikonmäki, Pettusaari, Siikosaari, and Pajunokka, as well as the lake Lamminjärvi.
Saarikonmäki, a hill located 3.0 km north-west of Lempäälä, offers a potential vantage point.
Pettusaari, a hill 3.1 km north-east of Lempäälä, is another local feature.
Siikosaari, an island 3.6 km west of Lempäälä, and Pajunokka, a headland 3.7 km west of Lempäälä, are also nearby geographical points. Lamminjärvi, a lake 4.0 km north-west of Lempäälä, is another feature.
Between January 1, 2015, and December 31, 2016, there were 40 verified aurora reports within 300 km of Lempäälä.
Notable qualifying nights with Kp values of 5.0 or higher occurred on March 20, 21, 22, 23, and 24, 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 Lempäälä forecast and pushes an alert when the odds for tonight clear your threshold — no checking, no guessing.
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Forecasts for places within reach of Lempäälä.