Will I see the southern lights in Stewart Island tonight?
Probably not
Clouds and quiet aurora activity (Kp 1.7 forecast, 6.4 needed here) both work against you tonight.
Hour by hour tonight
Loading tonight's hours…
Times are local (Pacific/Auckland). Only hours with the sun below −6° are shown. Kp forecast: NOAA SWPC. Clouds: MET Norway.
Planning a trip to Stewart Island?
Auroras in Stewart Island need a geomagnetic storm (about Kp 6.4). In 2015–2025 that lined up with a clear, dark sky on about 2 nights a year, so treat a sighting here as a bonus, not a plan.
Every night you could have seen them, 2015–2025
20 nights in 11 years were clear and dark in Stewart Island while auroras reached far enough, by our estimate from NASA cloud data and the Kp record. The strongest: 11 May 2024 (Kp 9). Most came near the solar maximum of 2024–2025.
- 17 Mar Kp 7.7
- 22 Jun Kp 8.3
- 11 Sep Kp 7
- 20 Sep Kp 7
- 8 Sep Kp 8.3
- 12 May Kp 7
- 4 Nov Kp 7.7
- 27 Feb Kp 6.7
- 5 Nov Kp 7.3
- 1 Dec Kp 6.7
- 24 Mar Kp 8.3
- 2 May Kp 6.7
- 11 May Kp 9
- 28 Jun Kp 7.7
- 12 Aug Kp 8
- 12 Sep Kp 6.7
- 11 Oct Kp 7.7
- 1 Jan Kp 8
- 1 Jun Kp 7.7
- 2 Jun 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 6.4 that Stewart Island needs. Look south, low on the horizon, away from town lights: the southern lights here are usually a glow that a phone camera picks up better than your eyes.
Stewart Island southern lights: questions
Rarely. Stewart Island sits at 54.3° magnetic latitude, so auroras need about Kp 6.4, which means a geomagnetic storm. In 2015–2025 it averaged 2 nights a year with a clear, dark sky and auroras strong enough to see (the aurora australis, low in the southern sky).
There is no reliable season: auroras this far north 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 6.4. We worked that out from Stewart Island's magnetic latitude (54.3°) with a rule calibrated against the Finnish Meteorological Institute's sighting statistics. Look south, 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 Stewart Island, add the sun and moon, and score each hour of tonight. The verdict is the best hour. How it works explains the calibration.