Live aurora forecast

Northern lights in Rebun Island tonight

Northern Hokkaido, Japan · 39° magnetic latitude · Kp 7-8 threshold

Aurora visibility · Rebun Island
1/9
Unlikely tonight

Kp 1 is well below the Kp 7-8 threshold needed for aurora to be visible from Rebun Island.

QuietStormExtreme
Threshold
Kp 7-8
Magnetic latitude
~39°N
Bz ↓ south
- nT
Solar wind
- km/s
Density
- p/cm³
Cloud
-
Conditions right now: - Kp + Bz + solar wind + cloud + moon

Updated: 20 Jul, 12:59 UTC

7-day outlook for Rebun Island

Today
20 Jul
1
Quiet
Tomorrow
21 Jul
3
Quiet
Wed
22 Jul
3
Quiet
Thu
23 Jul
3
Quiet
Fri
24 Jul
3
Quiet
Sat
25 Jul
3
Quiet
Sun
26 Jul
3
Quiet

Based on CME arrival predictions from NASA DONKI. Arrival times ±6 hours.

auroratonight.space

What Kp is needed here?

Rebun Island sits at a magnetic latitude of approximately 39°N. 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 7-8 before the auroral oval expands far enough south to be visible from here.

At Kp 7-8, visibility is possible from Rebun Island but skies need to be clear and dark. Cloud cover and light pollution remain the main obstacles even when Kp is high enough.

Plan your viewing

Best dark sky sites near Rebun Island

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

Sukoton Cape (Sukoton Misaki)

Get directions ↗
Bortle Class 1-2 - Exceptional dark sky 22 km from Kafuka Port - approximately 40 minute drive on the island road

Sukoton Cape is the northernmost point of Rebun Island and the northernmost accessible point in Japan open to the public. From the cliff edge, the horizon faces north over the La Perouse Strait toward Sakhalin Island 43 km away. Bortle Class 1-2. There is no artificial light to the north, west, or east. The headland gives a full open sky in all directions above the sea. At Kp 7-8, aurora can appear low on the northern horizon from this position - the same threshold as Wakkanai on the mainland. A 30-40 minute drive from Kafuka on a single-lane island road. In winter (November to April), access conditions depend on snow; check locally before driving at night.

Momoiwa viewpoint

Get directions ↗
Bortle Class 2 - Excellent dark sky 10 km from Kafuka Port - approximately 20 minute drive

The Momoiwa (Peach Rock) viewpoint on the west coast of Rebun gives an elevated position above the Sea of Japan. Bortle Class 2. The viewpoint faces west and southwest over open water. At Kp 7-8 aurora can appear in the northwest direction from this position. The car park is accessible year-round on the main island road. Less dramatic than Sukoton Cape in terms of northern horizon, but easier to reach and less exposed to north winds in winter. A practical first stop for aurora watching on arriving at the island before driving further north.

Funadomari north coast

Get directions ↗
Bortle Class 1-2 - Exceptional dark sky 17 km from Kafuka Port - approximately 30 minute drive

Funadomari is a small fishing community on the northern coast of Rebun Island, 5 km south of Sukoton Cape. The shore faces north over the strait. Bortle Class 1-2 - the village has minimal lighting and the few houses face away from the coast. The beach and headland at Funadomari give a ground-level position with the open strait ahead. In winter, this is a cold and exposed position - appropriate clothing and a vehicle with heating are required. The beach gives a flat foreground for wide-angle photography with aurora overhead.

When to go

Best time to see the northern lights in Rebun Island

At 39°N magnetic latitude, Rebun Island sits at the lower end of regular aurora territory. Only the deep mid-winter months of November through January offer nights dark enough for aurora to be visible, and only then when a significant geomagnetic storm pushes the auroral oval this far south.

Activity peaks around the September and March equinoxes, when Earth's magnetic field geometry is most favourable for coupling with the solar wind. Events during these two windows tend to produce the strongest displays of the year for observers at Rebun Island's latitude.

Outside November through January, twilight is too bright for aurora viewing even during significant storms. The season is short, but the equinox months on either side of winter can extend it slightly when storm timing aligns.

Up to 8 locations

Rebun Island

Japan

Unlikely
Kp 1 need Kp 7-8
Checking darkness…
Wakkanai

Japan

Unlikely
Kp 1 need Kp 7-8
Checking darkness…
Unlikely
Kp 1 need Kp 7-8
Checking darkness…
The odds

How often does the aurora appear in Rebun Island?

Average nights per month the Kp reached Rebun Island's threshold of 7+, from 15 years of geomagnetic data (2010–2024).

0.1Jan
0.1Feb
0.1Mar
0.1Apr
0.1May
0.1Jun
0.1Jul
0.1Aug
0.1Sep
0.1Oct
0.1Nov
0.1Dec

Counts the Kp 7+ threshold only - cloud cover and local darkness are not included.
Kp data: GFZ German Research Centre for Geosciences, CC BY 4.0

Make it happen

Plan your trip to Rebun Island

Based on 15 years of geomagnetic data (2010–2024)

1st
January
0.1
avg aurora nights
Requires an extended stay
2nd
February
0.1
avg aurora nights
Requires an extended stay
3rd
March
0.1
avg aurora nights
Requires an extended stay

Best window

The January to March window averages 0 aurora nights - the strongest consecutive stretch of the year.

How long to stay

Aurora at this latitude requires patience - allow as many nights as possible during January.

Questions

Common questions about aurora in Rebun Island

Why is Rebun Island one of Japan's best aurora positions?
Rebun Island sits at about 45.3°N geographic latitude but only around 39° geomagnetic latitude - the latitude measured from Earth's magnetic poles, which is what actually decides where the aurora reaches. That is still higher than anywhere else inhabited in Japan, so the Kp threshold here, 7-8, is the lowest in the country, the same as Wakkanai on the nearby mainland. Rebun also has no urban area: Kafuka, the main port town, is a fishing village with minimal light pollution, and Sukoton Cape at the northern tip gives Bortle Class 1-2 conditions. Japan's highest geomagnetic latitude paired with genuine dark sky makes this one of the best-positioned accessible aurora locations in the country.
What Kp is needed for aurora at Rebun Island?
Kp 7-8 from the dark coastal positions, a G3 storm or stronger. The Kp index measures global geomagnetic activity on a scale from 0 (quiet) to 9 (extreme storm), updated every 3 hours. At ~39° geomagnetic latitude, only a major geomagnetic storm pushes the auroral oval far enough south to show as a red glow low on the northern horizon. Kp is a 3-hour global average, so the threshold being met means a night is worth checking, not a guarantee. Storms at this level occur only a handful of times a year even during the active 2025-2026 solar maximum, and the aurora here is usually clearer on a long-exposure photograph than to the naked eye. This is an exceptional event, not a reliable nightly occurrence.
How do I get to Rebun Island?
Ferry from Wakkanai port on the Hokkaido mainland. The ferry takes approximately 2 hours to Kafuka, the main port on Rebun Island. Heartland Ferry operates this route; in winter the schedule is reduced and can be affected by sea conditions - always check before travelling. In calm winter conditions, the crossing typically runs once or twice daily. There is no airport on Rebun Island. Wakkanai is accessible by express train from Sapporo (5-6 hours) or Memanbetsu Airport near Abashiri. Most visitors stay on the island for 1-2 nights given the ferry schedule.
Can I see both Rebun Island and Rishiri Island on the same trip?
Yes. Rishiri Island is directly south of Rebun and both are served by ferry from Wakkanai. A common itinerary visits Wakkanai (Cape Soya, mainland Hokkaido's northernmost point), then takes the ferry to Rishiri, and then a second short ferry crossing to Rebun. The inter-island ferry between Rishiri and Rebun takes about 45 minutes. Rishiri adds the distinctive backdrop of the Rishiri-Fuji volcano (1,721 m). Both islands are at the same ~39° geomagnetic latitude and have the same Kp 7-8 threshold. See the <a href="/japan/rishiri-island" class="text-accent hover:underline">Rishiri Island page</a> for the island-specific dark sky positions.
How do I know when aurora is happening at Rebun Island?
Set up a push notification at /northern-lights-alert with a Kp 7 threshold. Storms at this level are not predictable more than 1-3 days in advance, and conditions can develop in a few hours. The notification means you do not need to check manually. On the island itself, Kafuka accommodation is a short distance from dark sky - you can be at Funadomari (17 km) or Sukoton Cape (22 km) within 30-40 minutes of an alert. Because a qualifying night is rare, treat any aurora as a bonus on a trip made for the island itself rather than the main reason to come.
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