Aurora Borealis in Valkeakoski
Finland · 61.26°, 24.03° · geomagnetic 58.9° · needs Kp 5
Tonight's aurora forecast for Valkeakoski
41%
Peak chance of a visible display tonight, from the same model the Revon app runs. Valkeakoski 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 Valkeakoski
Valkeakoski generally needs planetary Kp 5 before the aurora borealis reaches the local sky. Historical Kp and darkness data produce about 20.1 viable nights a year across 10.0 years of records.
The strongest historical overlap of darkness and activity occurs in September, March and October. From May through August, limited astronomical darkness can prevent viewing.
The central sky is approximately Bortle 6. The supplied darker-sky reference is 12 km east at Bortle 5.
Aurorasaurus recorded 40 verified reports within 300 km of Valkeakoski between 2015-01-01 and 2016-12-31. These records describe past observations, not tonight's prediction.
Sources: Revon analysis of NOAA planetary Kp · Solar declination and hour-angle calculation · Falchi 2016 World Atlas of artificial night sky brightness · Aurorasaurus verified positive reports
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Revon watches the Valkeakoski forecast and pushes an alert when the odds for tonight clear your threshold — no checking, no guessing.
Nearby towns
Forecasts for places within reach of Valkeakoski.