Aurora Borealis in Juneau, United States Tonight
Aurora Borealis predictions for Juneau tonight — updated every 6 hours
30-Night Aurora Outlook for Juneau
First 7 nights from data, remaining nights available in the app
Aurora forecasts for other cities
Aurora Borealis in Juneau — What You Need to Know
Aurora Borealis & the Auroral Oval in Juneau
Juneau is located at 58.3°N, 134.4°W (geographic) and 61.6° magnetic latitude. This places it within reach of the auroral oval during moderate storms. The northern lights (aurora borealis) are visible during moderate to strong geomagnetic storms, requiring a minimum Kp index of 5.
Note that Juneau's magnetic latitude (61.6°) differs from its geographic latitude (58.3°) by 3.3°. This is because Earth's magnetic pole is offset from the geographic pole. For aurora forecasting, magnetic latitude is what matters — it determines how close you are to the auroral oval.
What is the Kp index?
The Kp index is a 0–9 scale that measures global geomagnetic disturbance. Higher Kp values push the auroral oval further from the poles — at Kp 3, aurora is common above 65° magnetic latitude; at Kp 7+, it can reach below 50°. A Kp of 5 (moderate storm) is needed. Kp 5 is classified as a G1 geomagnetic storm by NOAA — these happen roughly 900 times per solar cycle (about every 11 years).
Aurora Borealis Viewing Conditions in Juneau
Even when the Kp index is high enough for Juneau, several factors determine whether you'll actually see the aurora:
- Cloud cover — the single biggest obstacle. You need clear or mostly clear skies.
- Darkness — aurora is only visible when the sun is at least 6° below the horizon (civil twilight or darker).
- Moonlight — a bright moon (especially full) washes out fainter aurora displays. New moon nights are ideal.
- Light pollution — urban skyglow reduces contrast (Falchi et al. 2016). Getting even 15–20 km outside the city center makes a noticeable difference.
Best Time to See Aurora Borealis in Juneau
The best time to see aurora in Juneau is September through March, when nights are long enough for observation. At this high latitude, summer months bring extended twilight or midnight sun — aurora may be active overhead but invisible against a bright sky. The equinox months (September and March) often bring enhanced geomagnetic activity due to the Russell-McPherron effect.
Frequently Asked Questions — Aurora Borealis in Juneau
Can I see aurora borealis in Juneau tonight?
It depends on the current Kp index. Juneau needs a Kp of 5 or higher for aurora borealis to be visible. Check the live forecast above for tonight's prediction, or download the Revon app for real-time alerts.
What Kp index is needed for northern lights in Juneau?
Juneau is at 61.6° magnetic latitude and requires a minimum Kp index of 5 for aurora to be visible. The Kp index is a 0-9 scale measuring geomagnetic activity — higher values push the auroral oval further from the poles.
When is the best time to see aurora borealis in Juneau?
The best time to see aurora borealis in Juneau is September through March, when nights are long and dark enough for observation. Within those months, the hours between 10 PM and 2 AM local time typically offer the best chances.
How does the aurora borealis forecast work?
The forecast combines NOAA solar wind and Kp index data with a machine learning model to predict aurora probability for each location. It updates every 6 hours on the website and every 15 minutes in the Revon app, which also factors in cloud cover, darkness, moonlight, and light pollution.