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Northern lights Saaremaa tonight

Saaremaa is Estonia's largest island in the Baltic Sea at 58°N magnetic latitude - one of the darkest and most aurora-accessible locations in the Baltic region. Kp 3–4 is enough for aurora from the coastal dark sites. Harilaid on the northwest tip reaches Bortle Class 2. The Angla windmills provide an unusual Estonian foreground for aurora photography. Connected to the mainland by ferry and causeway. Best season: September to April.

Aurora visibility - Saaremaa

Unlikely tonight

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

Current Kp

1

of 9

Threshold for Saaremaa: Kp 3–4 Magnetic latitude: ~58°N Updated: 21 May, 22:55 UTC
↓ Bz nT Solar wind km/s Density p/cm³
Conditions right now: Kp + Bz + solar wind + cloud + moon

7-day outlook for Saaremaa

Today

21 May

Quiet

Tomorrow

22 May

Quiet

Sat

23 May

Quiet

Sun

24 May

Quiet

Mon

25 May

Quiet

Tue

26 May

Quiet

Wed

27 May

Quiet

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

What Kp is needed here?

Saaremaa sits at a magnetic latitude of approximately 58°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 3–4 before the auroral oval expands far enough south to be visible from here.

At Kp 3–4, visibility is possible from Saaremaa 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 Saaremaa

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

Sõrve Peninsula - Sääre lighthouse

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Bortle Class 2-3 - Excellent dark sky 45 km from Kuressaare - approximately 50 minute drive

Sõrve is the southernmost peninsula of Saaremaa, tapering to a narrow point at Sääre where a lighthouse stands at the tip. The surrounding land is flat agriculture and forest with no settlement at the point, and the road is paved to Sääre village then gravel to the lighthouse itself. The peninsula has a WWII German military history with bunkers visible along the road. Bortle Class 2-3 throughout the lower Sõrve peninsula, with a completely unobstructed north sky from the tip.

Harilaid Nature Reserve

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Bortle Class 2 - Excellent dark sky 70 km from Kuressaare - approximately 80 minute drive

Harilaid is a narrow peninsula on the northwestern tip of Saaremaa, designated as a nature reserve protecting coastal dunes and seabird colonies. There are no buildings and no artificial lighting within the reserve; it faces northwest and north over open Baltic Sea with no significant land between Saaremaa and northern Sweden. The track to the nature reserve is unsealed and may require a car with reasonable ground clearance in wet conditions. Bortle Class 2 throughout, with the nearest settlement at Kihelkonna 15 km to the south contributing negligible sky glow.

Angla windmill hill

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Bortle Class 3 - Rural sky 35 km from Kuressaare - approximately 35 minute drive

Angla is a hilltop with Estonia's largest collection of traditional wooden windmills - five still standing in a row on the ridge above the Kaarma parish farmland. The ridge orientation faces north, providing a clear aurora viewing direction, with the windmill silhouettes forming a distinctive foreground for photography. The surrounding countryside is agricultural with minimal light pollution in any direction, and an information board and small car park are at the site. Bortle Class 3, with the elevated ridge giving sightlines across flat Saaremaa farmland toward the northern horizon.

Best time to see the northern lights in Saaremaa

Saaremaa's aurora season runs from late September through to March, when nights are long enough for truly dark skies. The equinox months, September and March, bring a natural boost in geomagnetic activity, making them statistically the best of the season. Summer months bring too much twilight for aurora to be visible at this latitude.

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

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 Saaremaa's latitude.

April through August brings persistent astronomical twilight that washes out aurora completely. Even strong events (Kp 6+) remain invisible during this period because the sky never gets dark enough.

Common questions

Northern lights from Saaremaa - Harilaid, Sõrve Peninsula, Angla windmills, and when to go.

What Kp is needed for aurora from Saaremaa?
The Kp index is a global measure of geomagnetic activity on a scale from 0 (quiet) to 9 (extreme storm), updated every 3 hours. Saaremaa at 58°N magnetic latitude needs Kp 3-4 for aurora from the dark coastal sites at Harilaid and Sõrve. This is the same threshold as Bergen, Norway, and Skagen in Denmark. The island's separation from mainland light pollution gives it a genuine Bortle Class 2 at Harilaid, where faint aurora activity detectable only by camera on the mainland becomes visible to the naked eye.
How do I get to Saaremaa?
Saaremaa is connected to the Estonian mainland by a fixed causeway via the smaller island of Muhu. The route uses the Virtsu-Kuivastu ferry (30 minutes) across the Väinameri strait, then crosses Muhu by road to the Saaremaa bridge. Total journey from Tallinn: approximately 3 hours by car. From Pärnu, allow 2 hours 15 minutes. Regular public bus services run from Tallinn via the ferry. The island's main town is Kuressaare, which has hotels, restaurants, and hire car facilities.
Why is Saaremaa good for aurora?
Saaremaa's combination of high magnetic latitude, island isolation, and low population density makes it one of the Baltic's best aurora sites. The island has a permanent population of around 33,000 - mostly concentrated in Kuressaare - leaving large areas of coast and farmland completely dark. The northwest coast at Harilaid faces open Baltic with no significant land between Saaremaa and northern Sweden. Kp 3-4 aurora that produces only a faint northern glow from Riga or Tallinn's suburbs can appear as a clear overhead display from Harilaid's dunes.
What makes Saaremaa's windmills good for aurora photography?
The Angla windmill hill gives a cluster of traditional Estonian post windmills silhouetted against the northern sky - the same compositional element repeated five times gives a strong horizon line that complements aurora displays overhead. The windmills face north, making them visible from behind during northward-looking aurora shots. The dark rural surroundings ensure the windmill structures are silhouetted rather than lit from behind by ground light sources. No tripod restrictions apply at night.
When is the best time for aurora on Saaremaa?
September to April. The equinox months of September and March give the highest probability of elevated geomagnetic activity combined with adequate darkness. The island's position in the eastern Baltic gives it a continental influence in winter - cold, sometimes clear high-pressure conditions that can last for days. Fog is a risk in autumn on the low-lying coastal areas. March on Saaremaa offers the unusual combination of occasional ice on the coast, cold clear nights, and statistically elevated aurora probability from the spring equinox effect.

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