Aurora Borealis in Varennes
Canada · 45.68°, -73.43° · geomagnetic 55.0° · needs Kp 7
Tonight's aurora forecast for Varennes
5%
Peak chance of a visible display tonight, from the same model the Revon app runs. Varennes needs Kp 7 to see anything at all, and tonight the forecast peaks at Kp 5.0. 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 Varennes
Varennes generally needs planetary Kp 7 before the aurora borealis reaches the local sky. Historical Kp and darkness data produce about 3.2 viable nights a year across 10.0 years of records.
The strongest historical overlap of darkness and activity occurs in May, September and August.
The central sky is approximately Bortle 7. The supplied darker-sky reference is 56 km north-west at Bortle 5.
Aurorasaurus recorded 39 verified reports within 300 km of Varennes 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
Know when it is worth going outside
Revon watches the Varennes 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 Varennes.