Aurora Borealis in Willowdale

Canada · 43.77°, -79.40° · geomagnetic 53.0° · needs Kp 7

Tonight's aurora forecast for Willowdale

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Peak chance of a visible display tonight, from the same model the Revon app runs. Willowdale 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.

Tonight Tue 08 Sep
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Get the full 30-night forecast in Revon

Updated 2026-09-08 10:35 UTC

Local aurora guide for Willowdale

Willowdale 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 9. The supplied darker-sky reference is 54 km north at Bortle 5.

Aurorasaurus recorded 63 verified reports within 300 km of Willowdale 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 Willowdale 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 Willowdale.