Aurora tonight in Luleå

Can you see the aurora borealis from Luleå?

Displays over Luleå are not news. The city lies near enough to the auroral oval that a modest level of geomagnetic activity is all it takes.

Luleå needs only Kp 2, the lowest threshold of any city on Sweden's Baltic coast, and the reason is simply that it sits further north than Stockholm or Umeå — close enough to the oval that ordinary activity reaches it. The frozen Bothnian bay extends that advantage by removing every light source on the horizon.

Country

Sweden

Magnetic latitude

65.6°N

Geographic latitude

65.58°

Aurora threshold

Kp 2

Light pollution

Bortle 5

Deep-dark nights / yr

208

Sun at solar midnight

47.9° below horizon

Midnight sun

none

When to look: the Luleå aurora season

Counted properly, Luleå gets 208 nights of astronomical darkness a year. They begin around **8 Sep** and end about **3 Apr**, and inside that window the sky is dark enough that the only things standing between you and a display are cloud and geomagnetic activity. The counter-season is just as clearly defined: from about **4 Apr** to **7 Sep** (157 nights) the sun never gets 18° below the horizon, so the sky never reaches full darkness, and between roughly 20 Apr and 22 Aug it does not get properly dark at all — no display, however strong, is visible in that stretch.

The dark half of the year at Luleå delivers a genuinely black sky, with the sun 47.9° below the horizon at its deepest. The bright half is the trade-off: from around 4 Apr to 7 Sep the sun stays above 18° below the horizon, and nothing short of a major storm has a chance.

Where to go in Luleå

The archipelago and the frozen bay immediately offshore are the obvious choice: the horizon opens out over flat, dark ice.

Your viewing direction is fixed by Luleå's position relative to the magnetic pole: look north, low on the horizon at first, and find somewhere that side is open and unlit. The "best window" figure above is simply the first hour tonight where cloud cover falls under roughly 40% while the sky is dark enough here to show anything.

What Kp do you need in Luleå?

Here is what each Kp value would actually put in Luleå's sky — the row that matters is the one at Kp 2, which is where this city's magnetic latitude of 65.6° places its threshold:

Here the limiting factor is rarely the size of the storm — Kp 2 already delivers at this latitude. What catches people out is substorm timing: activity surges and fades within a three-hour Kp window, so a display can come and go while you are back inside making tea. Look up regularly rather than checking once.

How tonight's answer is calculated for Luleå

The score above is built from five weighted factors, each using Luleå's own figures rather than a regional default: Kp against a local threshold of 2 (35%), cloud cover averaged across the dark hours at 65.58°, 22.15° (25%), moon illumination (15%), this latitude's astronomical darkness window (15%) and Bortle 5 light pollution (10%). The scoring method, its inputs and its failure modes are written up in full on our methodology page. No account, no app, no email address — everything above is computed in your browser from NOAA and Open-Meteo data. Anonymous analytics and Google's advertising script are the only third parties involved, both explained on the privacy page.