Aurora Borealis in Mont-Saint-Hilaire
Canada · 45.57°, -73.19° · geomagnetic 54.9° · needs Kp 7
Tonight's aurora forecast for Mont-Saint-Hilaire
4%
Peak chance of a visible display tonight, from the same model the Revon app runs. Mont-Saint-Hilaire 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 Mont-Saint-Hilaire
Mont-Saint-Hilaire 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 54 km east at Bortle 5.
Aurorasaurus recorded 41 verified reports within 300 km of Mont-Saint-Hilaire 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 Mont-Saint-Hilaire 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 Mont-Saint-Hilaire.