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Aurora australis Stewart Island tonight

Stewart Island (Rakiura) sits at 59°S magnetic latitude - New Zealand's southernmost inhabited island and its lowest aurora threshold. Kp 3-4 is enough from south-facing beaches at Mason Bay or the Oban shoreline facing Foveaux Strait. Face south and look low on the horizon. Peak season: June to August.

Aurora visibility — Stewart Island

Unlikely tonight

Kp 1 is well below the Kp 3–4 threshold needed for aurora to be visible from Stewart Island.

Current Kp

1

of 9

Threshold for Stewart Island: Kp 3–4 Magnetic latitude: ~59°S Updated: 11 May, 16:01 UTC

What Kp is needed here?

Stewart Island sits at a magnetic latitude of approximately 59°S. The Kp index - a global measure of geomagnetic activity on a scale from 0 (quiet) to 9 (extreme storm), updated every 3 hours - needs to reach Kp 3–4 before the auroral oval expands far enough north to be visible from here.

At Kp 3–4, visibility is possible from Stewart Island but skies need to be clear and dark. Cloud cover and light pollution remain the main obstacles even when Kp is high enough.

Best dark sky sites near Stewart Island

Light pollution is the biggest obstacle after cloud cover. These sites give you the best dark southern horizon within reach.

Mason Bay (west coast)

A remote west-coast beach accessible by water taxi or a 3-hour walk from Oban. Almost no light pollution in any direction and a completely open southern ocean horizon. The beach faces due south - the ideal direction for aurora australis. One of the darkest and most southerly accessible positions in New Zealand. Camping at Mason Bay hut puts you in position for a full night watch during a Kp 3-4 event.

Ackers Point Lighthouse

A 40-minute walk east of Oban, the island's main settlement. The lighthouse headland faces southeast and gives partial southern sky. Less remote than Mason Bay but accessible without advance planning. The path is well-maintained and lit sections end before the point. Used by aurora photographers when the weather window is short and the boat to Mason Bay is not running.

Horseshoe Bay and south Oban shoreline

The bay immediately south of Oban has an open southern horizon across Foveaux Strait toward Southland. Light from the village is minimal. The shoreline east of the wharf gives a south-facing view across the strait. A practical first-night position for visitors arriving by ferry from Bluff before committing to a walk to the west coast.

Other New Zealand aurora forecasts

New Zealand overview Queenstown Dunedin Christchurch

Related pages

Aurora Australis New Zealand

New Zealand aurora hub - all South Island locations.

Aurora Australis

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Aurora Australis Queenstown

Queenstown - Remarkables dark sky, Kp 4-5 needed.

What Is the Kp Index?

How Kp 3-4 translates to aurora visibility at 59°S.

Northern Lights Viewing Tips

Dark site selection and camera settings — same principles apply to aurora australis.

Common questions

Aurora australis on Stewart Island — Kp threshold, access, and when to go.

Can you see aurora australis from Stewart Island?
Yes. Stewart Island (Rakiura) is one of the best aurora australis locations accessible to visitors. At 59°S magnetic latitude it needs only Kp 3-4 from south-facing dark sites. On clear nights with Kp 3, aurora may be visible as a glow on the southern horizon from Mason Bay. At Kp 4-5, full curtains can be visible. Stewart Island sees aurora australis several times per year during the current solar maximum.
What Kp is needed for aurora on Stewart Island?
Kp 3 from Mason Bay on the west coast. Kp 3-4 from the south-facing shores near Oban. At 59°S magnetic latitude, Stewart Island sits closer to the auroral oval than any other inhabited New Zealand location. This is the same magnetic latitude as Tromsø in Norway - at this latitude, even moderate geomagnetic activity produces aurora. Kp 3 events occur regularly throughout the year.
How do you get to Stewart Island for aurora watching?
Stewart Island is reached by ferry from Bluff (1 hour) or by light aircraft from Invercargill (20 minutes). Bluff is 30 minutes south of Invercargill. The ferry runs several times daily but not in severe weather. For the remote west-coast beaches, a water taxi from Oban (30 minutes) gives access to Mason Bay area, or the North West Circuit walking track (3-4 days) reaches the west coast on foot. Book accommodation in Oban in advance, particularly in winter.
When is the best time to see aurora australis on Stewart Island?
June to August for longest dark nights. At 46.9°S geographic latitude, Stewart Island has usable darkness from late April to September. July gives the longest night - about 14 hours of darkness. The September equinox is statistically the most geomagnetically active month. Avoid December to February when nights are under 8 hours. Cloud cover is frequent - check weather forecasts and be prepared to wait for a clear window.
Is Stewart Island worth visiting for aurora australis?
Yes, if you accept the conditions. Stewart Island is remote, weather-dependent, and requires planning. The payoff is one of the lowest aurora thresholds of any visitor-accessible location in the southern hemisphere. Mason Bay is an extreme dark sky position - Bortle 1 conditions on a clear moonless night, facing open Antarctic ocean. For aurora photographers, the combination of Kp 3 threshold, dark skies, and dramatic coastline makes Stewart Island a distinctive southern lights destination.