Aurora Borealis in Greater Sudbury

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

Tonight in Greater Sudbury

3%

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 5.1. Short of the threshold, which is what most nights look like here.

Tonight Sun 02 Aug
3%
18
20
22
00
02
04
06
Tomorrow Mon 3 Aug
2%
Hour-by-hour for this night is in the app
Tuesday Tue 4 Aug
2%
Hour-by-hour for this night is in the app

Unlock every hour in the app

Updated 2026-08-02 20:20 UTC

The next 30 nights in Greater Sudbury

Every night to come, scored the same way as tonight. The best of the open week is Sunday 2 Aug at 3%. Not one of the seven reaches the Kp 7 that Greater Sudbury needs, which is normal rather than unlucky — it averages 3.2 viable nights a year. The 23 nights past the seven-day window move with the 27-day solar rotation and are updated daily in the app.

Quiet geomagnetic conditions ahead. No significant aurora activity expected this month.

Sun 2
3%
Kp 5.1
Mon 3
2%
Kp 3.3
Tue 4
2%
Kp 1.3
Wed 5
2%
Kp 3.0
Thu 6
2%
Kp 3.0
Fri 7
2%
Kp 2.0
Sat 8
2%
Kp 2.0

Nights 8–30 unlock in the Revon app

See all 30 nights for Greater Sudbury

Revon aurora model over the NOAA Kp forecast and 27-day outlook

How often the aurora borealis reaches Greater Sudbury

3.2 nights a year, averaged across 10.0 years of records

Storm levelNights / year
Kp 483.4
Kp 528.7
Kp 69.3
Kp 73.2
Kp 81.2

NOAA planetary Kp, 2016-04-02 to 2026-03-30

Wait for an alert; do not book a week

At Kp 7, Greater Sudbury needs a severe geomagnetic storm before anything shows above the northern horizon. Storms that size arrive a handful of times per solar cycle and announce themselves a day or two ahead. Watching for one beats picking dates and hoping.

Hours of true darkness, month by month

JanFebMarAprMayJunJulAugSepOctNovDec
11.410.38.86.84.52.63.55.98.19.911.211.7

Solar declination and hour angle at −18°

Getting clear of the light

With 166,004 people around you, the sky over central Greater Sudbury is Bortle 6. The glow hides anything but the brightest display, so the drive out matters more here than the forecast does.

Falchi 2016 World Atlas (DOI: 10.5880/GFZ.1.4.2016.001)

The months that actually deliver

Counting only nights that were both stormy enough and dark enough, May, September and August came out ahead in Greater Sudbury. That is storm season and darkness overlapping — the equinoxes tend to be geomagnetically active, and the nights are already long by then.

Darkest nights of the coming year

A bright moon washes out a weak display as effectively as street lighting. These new moons fall inside the Greater Sudbury viewing season.

Where it is close to a certainty

If you would rather plan a trip than wait for a storm, the nearest place with genuinely frequent aurora is Nuuk, 2,655 km north-north-east in Greenland.

Greater SudburyNuuk
Kp needed73
Nights per year3.2 171.4
Geomagnetic latitude55.7° 72.6°

See the Nuuk forecast

Confirmed reports from this area

35 verified sightings were logged within 300 km of Greater Sudbury between 2015-01-01 and 2016-12-31. Rare is not the same as impossible.

Aurorasaurus verified positive reports

Where the horizon opens up near Greater Sudbury

The display sits low on the northern horizon, so what beats a better forecast is open ground facing that way. Height gets you above the town glow; water gives you an unbroken skyline. These are within a short drive of Greater Sudbury.

Places from GeoNames (CC BY 4.0)

Where to stay

Staying central in Greater Sudbury is fine for everything except the aurora itself — you will still need to drive out. If seeing it matters more than convenience, base yourself on the edge of town facing your dark spot.

Places from GeoNames (CC BY 4.0) — confirm before booking

The last nights it was visible here

Nights in the last decade when the storm was strong enough for Greater Sudbury and the sky was dark enough to show it.

DatePeak
2026-03-20Kp 7.0
2026-01-20Kp 7.67
2026-01-19Kp 8.67
2025-11-12Kp 7.33
2025-11-11Kp 8.67

NOAA planetary Kp

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

Common questions about the aurora borealis in Greater Sudbury

Can you see the aurora borealis from Greater Sudbury?

Yes. On the last 10.0 years of NOAA Kp records, Greater Sudbury had about 3.2 nights a year when the storm was strong enough and the sky dark enough at the same time.

What Kp index do you need to see the aurora borealis in Greater Sudbury?

Kp 7. Greater Sudbury sits at geomagnetic latitude 55.7°, and the auroral oval only reaches that far from the pole once activity hits Kp 7. Storms that size occur about 3.2 nights a year.

When is the best time of year to see the aurora borealis in Greater Sudbury?

May, September and August. Those months scored highest once both conditions are counted together: geomagnetic activity and enough hours of real darkness.

Where can you escape the light pollution near Greater Sudbury?

The centre of Greater Sudbury reads Bortle 6. The nearest sky at Bortle 4 is about 18 km east. On a marginal night that drive matters more than the forecast does.

Where is the nearest place to Greater Sudbury with reliable aurora borealis?

Nuuk, Greenland — 2,655 km north-north-east. It needs only Kp 3 and averages 171.4 viable nights a year against 3.2 in Greater Sudbury.

Nearby towns

Forecasts for places within reach of Greater Sudbury.