Northern Lights in Green Bay Tonight
Live forecast for Green Bay, Wisconsin: real-time solar wind measured 930,000 miles upstream, NOAA's OVATION model, your cloud forecast, and tonight's darkness, with one verdict for your eyes and one for your phone camera.
Aurora is unlikely tonight (0%), for eyes and cameras alike (0%). Kp is 1.3 right now, and Green Bay needs Kp 5+ for eyes and Kp 3.5+ for a phone camera. The best window is 9 PM–11 PM with 100% clouds and a forecast Kp up to 3.7, once the sky is dark enough at 1:08 AM.
Tonight's aurora odds
Your chance of catching aurora at any point tonight, combining the Kp forecast for tonight's dark hours, the cloud forecast, and the moon.
How we get this: forecast Kp peaks at 3.7 tonight, a 13% chance of reaching your eye threshold (Kp 5+) and 56% for camera (Kp 3.5+), times a 0% chance of usable sky in your clearest dark hours.
Nowcast
LiveCan you see it in Green Bay right now? Live Kp, darkness, and clouds — refreshed every two minutes.
The sky is not dark enough yet. Dark enough for aurora at 1:08 AM.
Best available stretch on a rough night
- Bz is northward (+3.2 nT), which suppresses aurora even at elevated Kp.
What's driving tonight's forecast
The live inputs behind the verdicts and odds: current space weather and hour-by-hour clouds.
3-day Kp outlook
NOAA's planetary Kp forecast in 3-hour bins. One global number, colored against what Green Bay needs (eye Kp 5+ · camera Kp 3.5+).
Reports are anonymous. They add real eyes on the sky to everything the model predicts.
Free Green Bay sky alerts, no app required
One email when aurora conditions align at your location, plus meteor reminder and go-time emails for peaks worth watching. Web alerts cover one US location per email.
Aurora viewing in Green Bay: what it takes
Green Bay sits at magnetic latitude 53.4°, the number that actually decides your aurora odds (it differs from geographic latitude because Earth's magnetic pole sits over the Canadian Arctic, which is why the Midwest outperforms Europe at the same map latitude). From here, aurora appears low on the northern horizon at roughly Kp 5, fills the northern sky around Kp 6, and can pass overhead at Kp 6.5+. Eye-visible displays happen roughly 10–25 nights per year near solar maximum.
The threshold most sites won't tell you: your phone camera only needs about Kp 3.5. A 3-second night-mode exposure collects light your dark-adapted eyes cannot, so on many nights the honest answer is "no to your eyes, yes to your camera." That's why this page gives two verdicts.
Where to watch near Green Bay
- Newport State Park ↗ (71 mi), Bortle 2, International Dark Sky Park. Wisconsin's only wilderness park and first Dark Sky Park, at the tip of Door County.
- Wilderness State Park ↗ (174 mi), Bortle 2, Dark Sky Preserve. Dark-sky preserve west of Mackinaw City with northern water horizons.
- Headlands International Dark Sky Park ↗ (180 mi), Bortle 2, International Dark Sky Park. Two miles of Lake Michigan shoreline at the Straits of Mackinac; a flagship Great Lakes dark-sky park.
- No time for a drive? Any spot with a dark, unobstructed northern horizon (a lakeshore, a ridge, farmland north of the city) beats a bright parking lot by a full activity level.
Northern lights in Green Bay: FAQ
›Can you see the northern lights in Green Bay tonight?
It depends on tonight's geomagnetic activity: Green Bay sits at magnetic latitude 53.4°, so aurora becomes visible on the northern horizon at roughly Kp 5+ and can appear overhead at Kp 6.5+. The live forecast at the top of this page combines the real-time solar wind, NOAA's OVATION model, tonight's cloud cover, and darkness to give you a straight yes/no answer, updated every couple of minutes.
›What Kp index does Green Bay need for aurora?
About Kp 5 for a visible glow on the northern horizon, Kp 6.5+ for overhead displays, and only about Kp 3.5 for a phone camera on night mode to capture it. Camera thresholds are lower because long exposures pick up sub-visual light your eyes can't.
›How often can you see the northern lights in Green Bay?
At magnetic latitude 53.4°, Green Bay sees eye-visible aurora roughly 10–25 nights per year near solar maximum. We're near solar maximum of Solar Cycle 25, so activity through 2026–2027 runs well above average.
›Where should I go to watch aurora near Green Bay?
Get away from city light and find an unobstructed view to the north. The best nearby dark-sky options are Newport State Park (71 mi), Wilderness State Park (174 mi), Headlands International Dark Sky Park (180 mi). Even a rural road 20–30 minutes north of town dramatically improves what you'll see.
›What's the best time of night to see aurora in Green Bay?
Statistically 10 PM to 2 AM local time, when your location rotates under the strongest part of the auroral oval, though substorms can fire at any dark hour. Our best-window forecast above combines darkness, clouds, and predicted Kp for tonight specifically.