Will I see the northern lights in Calgary tonight?
Probably not
Skies look mostly clear, but auroras are forecast to be quiet: Kp 1.3, and Calgary needs about Kp 5.1.
Hour by hour tonight
Loading tonight's hours…
Times are local (America/Edmonton). Only hours with the sun below −6° are shown. Kp forecast: NOAA SWPC. Clouds: MET Norway.
Planning a trip to Calgary?
Auroras in Calgary need a geomagnetic storm (about Kp 5.1). In 2015–2025 that lined up with a clear, dark sky on about 7 nights a year, so treat a sighting here as a bonus, not a plan.
Chance on a 4-night stay, week by week
By month
| Month | Dark / night | Clear & dark | 1 night | 3 nights | 4 nights | 7 nights |
|---|---|---|---|---|---|---|
| August | 6.8 h | 3.5 h | 2% | 6% | 8% | 14% |
| September | 9.0 h | 3.8 h | 3% | 9% | 12% | 20% |
| October | 11.0 h | 4.6 h | 3% | 9% | 10% | 18% |
| November | 12.4 h | 4.3 h | 2% | 4% | 6% | 5% |
| December | 13.9 h | 4.9 h | 1% | 2% | 3% | 5% |
| January | 12.9 h | 5.1 h | 1% | 3% | 3% | 6% |
| February | 11.4 h | 4.3 h | 2% | 6% | 8% | 13% |
| March | 9.7 h | 4.3 h | 3% | 8% | 10% | 18% |
| April | 7.4 h | 3.0 h | 1% | 4% | 5% | 7% |
"Clear & dark" = average hours per night with the sun below −12° and mostly clear sky. Odds = share of stays with at least one clear, dark hour when auroras were strong enough here.
Chance of at least one clear, dark night with auroras strong enough to see, from what really happened in the same week in each of 11 years.
Every night you could have seen them, 2015–2025
72 nights in 11 years were clear and dark in Calgary while auroras reached far enough, by our estimate from NASA cloud data and the Kp record. The strongest: 10 May 2024 (Kp 9).
The 10 strongest nights
- 10 May 2024 Kp 9
- 11 Nov 2025 Kp 8.7
- 31 May 2025 Kp 7.7
- 10 Oct 2024 Kp 7.7
- 3 Nov 2021 Kp 7.7
- 16 Mar 2015 Kp 7.7
- 1 Jun 2025 Kp 7
- 7 Oct 2024 Kp 7
- 16 Sep 2024 Kp 7
- 11 Aug 2024 Kp 7
A "night you could have seen them" = at least one hour that was dark, mostly clear and with Kp at or above the Kp 5.1 that Calgary needs. Look north, low on the horizon, away from town lights: the northern lights here are usually a glow that a phone camera picks up better than your eyes.
Better odds nearby
Places within 700 km of Calgary with more good nights a year.
Calgary northern lights: questions
Rarely. Calgary sits at 57.4° magnetic latitude, so auroras need about Kp 5.1, which means a geomagnetic storm. Our record (2015–2025) shows about 7 nights a year with a clear, dark sky and auroras strong enough to see.
There is no reliable season: auroras this far south come with strong geomagnetic storms, which can happen in any dark month. Watch the live forecast and the Kp index instead of planning a trip around them.
About Kp 5.1. We worked that out from Calgary's magnetic latitude (57.4°) with a rule calibrated against the Finnish Meteorological Institute's sighting statistics. Look north, low on the horizon, away from town lights.
Every 10 minutes we take NOAA's Kp forecast and MET Norway's hourly cloud forecast for Calgary, add the sun and moon, and score each hour of tonight. The verdict is the best hour. How it works explains the calibration.