Live · updated hourly
Is it worth going out tonight?
One honest verdict, built from the cloud forecast and geomagnetic activity. The sky behind this page is moving to match the conditions right now.
The next nine nights
Forecasts further out are less certain and use typical Kp beyond NOAA’s three-day horizon.
Get alerts for Tromsø
Give us your trip dates, or just ask to be told whenever it improves. We email you only when a night looks good, never on cloudy nights.
Where else?
Aurora forecasts for 8 places
Alta
—Drier skies, deep winter, and the birthplace of aurora science.
Lofoten
—Jagged peaks and red fishing huts under a green sky.
Abisko
—A rain shadow beside a frozen lake, reputed to be one of the clearest places in Europe.
Rovaniemi
—On the Arctic Circle, with snow, huskies and glass igloos.
Reykjavík
—Aurora from a capital city, with lava fields and geothermal pools a short drive away.
Fairbanks
—Inland Alaska: cold, dry, and under the oval more nights than almost anywhere in North America.
Yellowknife
—Under the oval, with a reputation for clear, still nights.
Understand the forecast
Learn the basics
What is the Kp index?
The 0–9 number behind every aurora alert, and what it does and doesn’t tell you.
ExplainerWhat is MET Norway?
The weather service whose cloud forecast powers every verdict on this site.
GuideAurora in Norway
Where, when and how to see the northern lights across the Arctic north.
Verdict = 65% clear sky (MET Norway) + 35% geomagnetic activity (NOAA Kp), minus a moonlight penalty. GO ≥ 65, MAYBE 40–64, SKIP < 40.