Aurora Forecast Tonight in Sisimiut
Aurora season in Sisimiut runs from September to April.
Tonight's Forecast
Moderate
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How we calculate the aurora score
ModerateWe combine geomagnetic activity (Kp), aurora oval probability (OVATION), cloud cover, darkness and moonlight, weighted for Sisimiut (region: auroral_oval).
Score 0–19. Conditions strongly limit aurora visibility.
Score 20–44. A faint aurora is possible only under perfect conditions.
Score 45–64. Aurora may be visible to alert observers in dark, clear skies.
Score 65–84. A good chance of a visible aurora display.
Score 85–100. Excellent odds — plan to be outside tonight.
Aurora visibility in Sisimiut is moderate tonight. Northern Lights may be visible if geomagnetic activity holds and local skies remain clear.
Max Kp
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Max Kp
Strong for this locationKp is comfortably above the local threshold.
5.7
Strong for this location
Cloud Cover
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Cloud Cover
Clear skiesUp to 25% cloud — excellent visibility.
23%
Clear skies
Moon
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Moon
Dark moonLess than 25% illuminated — minimal interference.
4%
Dark moon
OVATION
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OVATION
Moderate5–20% probability — aurora possible.
8%
Moderate
Best Viewing Window
1:00 AM – 3:00 AM
Best balance of darkness, geomagnetic activity and local sky conditions.
Direction to Look
Overhead or north
This location is close to the auroral oval, so aurora may appear overhead during stronger activity.
Recommendation
Watch the forecast and be ready to go outside if Kp rises or cloud cover improves.
Hour-by-hour visibility
Estimated aurora visibility score for each hour of tonight at Sisimiut.
12:00 AM
49/100Max Kp
3.0
Cloud Cover
27%
Moon
4%
OVATION
8%
51
1:00 AM
51/100Max Kp
2.7
Cloud Cover
16%
Moon
4%
OVATION
8%
76
2:00 AM
76/100Max Kp
2.7
Cloud Cover
20%
Moon
4%
OVATION
8%
3:00 AM
48/100Max Kp
2.7
Cloud Cover
34%
Moon
4%
OVATION
8%
4:00 AM
45/100Max Kp
2.7
Cloud Cover
59%
Moon
4%
OVATION
8%
Best viewing window: 1:00 AM – 3:00 AM. Peak around 2:00 AM with a visibility score of 76/100.
Why this forecast?
There is a moderate chance of visible aurora tonight. Some conditions are favorable, but clouds, moonlight or geomagnetic activity may still limit visibility.
Score breakdown
How tonight's aurora score for Sisimiut breaks down into activity and visibility components.
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Geomagnetic activity
30 / 30Geomagnetic activity (Kp 5.7) contribution to the score.
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Aurora oval probability
10 / 30OVATION aurora oval probability (8%) contribution.
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Cloud cover
13 / 20Cloud cover (37%) contribution — clear skies score full points.
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Darkness
15 / 15Sky darkness contribution — astronomical darkness scores full points.
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Moonlight
5 / 5Moon illumination (4%) contribution — new moon scores full points.
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Aurora zone
+10 ptsLatitude/zone bonus for Sisimiut.
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Geomagnetic activity (Kp index)
Strong for this locationKp measures how disturbed Earth's magnetic field is on a 0–9 scale. Higher Kp pushes the aurora oval toward the equator. Sisimiut needs Kp ≥ 1.
Kp is below the minimum needed at this latitude.
Kp is close to the minimum needed — a faint aurora may appear low on the horizon.
Kp meets the threshold for visible aurora here.
Kp is comfortably above the local threshold.
Storm-level Kp ≥ 5 — aurora can be seen far south of its usual zone.
Strong for this location
Geomagnetic activity is strong enough for Sisimiut, but local visibility conditions may still affect the view.
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Cloud cover
Clear skiesAverage cloud cover during the best viewing window. Clear skies are essential — even thin overcast hides the aurora.
Up to 25% cloud — excellent visibility.
25–50% cloud — aurora may peek through gaps.
50–85% cloud — most of the sky is blocked.
Over 85% cloud — aurora effectively hidden.
Clear skies
Skies are mostly clear, which is favorable for seeing the aurora.
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Sky darkness
Astronomical darknessAurora is faint and needs a dark sky. Astronomical darkness (sun more than 18° below horizon) is ideal.
Sun stays above 6° below horizon all night — no aurora-friendly darkness.
Sun 6–12° below horizon — too bright for faint aurora.
Sun 12–18° below horizon — sky is dark but not fully astronomical.
Sun more than 18° below the horizon — fully dark sky.
Astronomical darkness
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Moon illumination
Dark moonA bright moon washes out faint aurora colours. New moon is ideal; full moon hides everything but the strongest displays.
Less than 25% illuminated — minimal interference.
25–75% illuminated — faint aurora may be washed out.
Over 75% illuminated — only strong displays will be visible.
Dark moon
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Aurora oval probability (OVATION)
ModerateNOAA's OVATION model estimates the chance of aurora visible overhead within a 250 km radius of you.
Less than 5% probability — aurora unlikely to reach this location.
5–20% probability — aurora possible.
20–40% probability — aurora likely if skies are clear.
Over 40% probability — aurora very likely overhead.
Moderate
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Aurora zone
Excellent zoneHow favourable Sisimiut's latitude is for aurora viewing in general — independent of tonight's conditions.
Lower latitude — aurora is rare and requires a major storm.
Mid-latitude — aurora visible only during moderate-to-strong storms.
High-latitude region — aurora is visible on most active nights.
Directly under the auroral oval — aurora is a regular occurrence.
Excellent zone
Sisimiut is in a prime aurora zone, so aurora can be visible during regular activity when skies are dark and clear.
Data sources
- · NOAA SWPC Kp forecast
- · NOAA OVATION aurora model
- · Open-Meteo cloud forecast
Aurora Forecast AI Tracker
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Best Months to See the Northern Lights in Sisimiut
The aurora season in Sisimiut usually runs from September to April.
Sisimiut is located in the auroral oval region, which means auroras can often become visible when the Kp index reaches around 1 or higher. The best chances usually come during the darkest months of the season, with clear skies and low light pollution.