Aurora Borealis in Nepean
Canada · 45.34°, -75.72° · geomagnetic 54.7° · needs Kp 7
Tonight in Nepean
1%
Peak chance of a visible display tonight, from the same model the Revon app runs. Nepean 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.
Updated 2026-08-02 20:20 UTC
The next 30 nights in Nepean
Every night to come, scored the same way as tonight. The best of the open week is Sunday 2 Aug at 1%. Not one of the seven reaches the Kp 7 that Nepean 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.
Nights 8–30 unlock in the Revon app
Revon aurora model over the NOAA Kp forecast and 27-day outlook
How often the aurora borealis reaches Nepean
3.2 nights a year, averaged across 10.0 years of records
| Storm level | Nights / year |
|---|---|
| Kp 4 | 83.4 |
| Kp 5 | 28.7 |
| Kp 6 | 9.3 |
| Kp 7 | 3.2 |
| Kp 8 | 1.2 |
NOAA planetary Kp, 2016-04-02 to 2026-03-30
Wait for an alert; do not book a week
At Kp 7, Nepean 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
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 11.4 | 10.3 | 8.9 | 6.9 | 4.8 | 3.2 | 3.9 | 6.1 | 8.2 | 9.9 | 11.1 | 11.7 |
Solar declination and hour angle at −18°
Getting clear of the light
With 180,000 people around you, the sky over central Nepean is Bortle 8. The glow hides anything but the brightest display, so the drive out matters more here than the forecast does.
- 38 km east-south-east — around Russell → Bortle 5
- 45 km west-north-west — around Pontiac → Bortle 4
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 Nepean. 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 Nepean viewing season.
- 13 Aug 2026
- 11 Sep 2026
- 11 Oct 2026
- 09 Nov 2026
- 09 Dec 2026
- 07 Jan 2027
- 06 Feb 2027
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, 2,567 km north-north-east in Greenland.
| Nepean | Nuuk | |
|---|---|---|
| Kp needed | 7 | 3 |
| Nights per year | 3.2 | 171.4 |
| Geomagnetic latitude | 54.7° | 72.6° |
Confirmed reports from this area
57 verified sightings were logged within 300 km of Nepean 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 Nepean
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 Nepean.
- Mooneys Bay Beach — beach4.1 km north-east
- Mooneys Bay — bay4.6 km north-east
- Hogs Back — park4.7 km north-north-east
- Dows Lake — lake6.6 km north-north-east
- Mud Lake — lake6.9 km north-west
- Nanny Goat Hill — hill7.3 km north-north-east
Places from GeoNames (CC BY 4.0)
What to do with the daylight
Aurora watching is a night job, and in winter that leaves a short, bright day to fill. Close to Nepean you will find Peace Tower, and for a day when the cloud sits low, Canada Agriculture and Food Museum, Canadian Museum of Nature and Canadian War Museum are indoors and near by.
Keep the daylight loose: the sky decides the evening, and the forecast can turn within a few hours.
Places from GeoNames (CC BY 4.0)
Where to stay
Staying central in Nepean 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.
- Days Inn Ottawa Airport 3.1 km from the centre
- Holiday Inn Express & Suites O 4.3 km from the centre
- Holiday Inn Express Hotel & Suites Ottawa Airport 4.3 km from the centre
- Cardinal Suites 4.8 km from the centre
- Embassy West Hotel, Conference Centre 5.5 km from the centre
- Travelodge Convention Center Ottawa West 5.5 km from the centre
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 Nepean and the sky was dark enough to show it.
| Date | Peak |
|---|---|
| 2026-03-20 | Kp 7.0 |
| 2026-01-20 | Kp 7.67 |
| 2026-01-19 | Kp 8.67 |
| 2025-11-12 | Kp 7.33 |
| 2025-11-11 | Kp 8.67 |
NOAA planetary Kp
Know when it is worth going outside
Revon watches the Nepean forecast and pushes an alert when the odds for tonight clear your threshold — no checking, no guessing.
Common questions about the aurora borealis in Nepean
Can you see the aurora borealis from Nepean?
Yes. On the last 10.0 years of NOAA Kp records, Nepean 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 Nepean?
Kp 7. Nepean sits at geomagnetic latitude 54.7°, 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 Nepean?
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 Nepean?
The centre of Nepean reads Bortle 8. The nearest sky at Bortle 4 is about 45 km west-north-west around Pontiac. On a marginal night that drive matters more than the forecast does.
Where is the nearest place to Nepean with reliable aurora borealis?
Nuuk, Greenland — 2,567 km north-north-east. It needs only Kp 3 and averages 171.4 viable nights a year against 3.2 in Nepean.
Nearby towns
Forecasts for places within reach of Nepean.