Aurora Borealis in Greater Sudbury

Canada · 46.49°, -80.99° · geomagnetic 55.7° · needs Kp 7

Tonight's aurora forecast for Greater Sudbury

9%

Peak chance of a visible display tonight, from the same model the Revon app runs. Greater Sudbury 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
9%
18
20
22
00
02
04
06

Get the full 30-night forecast in Revon

Updated 2026-09-08 10:35 UTC

Local aurora guide for Greater Sudbury

Greater Sudbury 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 6. The supplied darker-sky reference is 18 km east at Bortle 4.

Aurorasaurus recorded 35 verified reports within 300 km of Greater Sudbury 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 Greater Sudbury forecast and pushes an alert when the odds for tonight clear your threshold — no checking, no guessing.

Get aurora alerts on iPhone

Nearby towns

Forecasts for places within reach of Greater Sudbury.