Moderate Activity 🌒 3% Updated live

Aurora Forecast for
Castelo Branco Tonight

Current northern lights conditions for Castelo Branco, Centro, Portugal. Latitude 39.8°N · AACGM-v2 magnetic latitude 31.4°N.

Quick Summary: The estimated northern lights outlook for Castelo Branco peaks at 0% over the next 24 hours. No suitable viewing window.

Aurora forecast

0%

Estimated

Highest estimate · next 24 hours

Viewing window

No suitable viewing window

Europe/Lisbon

Kp index

4

Moderate

Planetary geomagnetic activity

Cloud cover

1%

Clear skies

Current sky visibility

Aurora

Tonight's Verdict

Low aurora probability in Castelo Branco tonight. Check back tomorrow for updated conditions.

Hourly Forecast · Estimated

22
22:00 — 0%
23:00 — 0%
00:00 — 0%
01:00 — 0%
02:00 — 0%
03:00 — 0%
04
04:00 — 0%
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07:00 — 0%
08:00 — 0%
09:00 — 0%
10
10:00 — 0%
11:00 — 0%
12:00 — 0%
13:00 — 0%
14:00 — 0%
15:00 — 0%
16
16:00 — 0%
17:00 — 0%
18:00 — 0%
19:00 — 0%
20:00 — 0%
21:00 — 0%
22:00 UTC04:00 UTC10:00 UTC16:00 UTC21:00 UTC
Time (UTC)Estimated (%)
2026-10-12T22:00:00.000Z0%
2026-10-12T23:00:00.000Z0%
2026-10-13T00:00:00.000Z0%
2026-10-13T01:00:00.000Z0%
2026-10-13T02:00:00.000Z0%
2026-10-13T03:00:00.000Z0%
2026-10-13T04:00:00.000Z0%
2026-10-13T05:00:00.000Z0%
2026-10-13T06:00:00.000Z0%
2026-10-13T07:00:00.000Z0%
2026-10-13T08:00:00.000Z0%
2026-10-13T09:00:00.000Z0%
2026-10-13T10:00:00.000Z0%
2026-10-13T11:00:00.000Z0%
2026-10-13T12:00:00.000Z0%
2026-10-13T13:00:00.000Z0%
2026-10-13T14:00:00.000Z0%
2026-10-13T15:00:00.000Z0%
2026-10-13T16:00:00.000Z0%
2026-10-13T17:00:00.000Z0%
2026-10-13T18:00:00.000Z0%
2026-10-13T19:00:00.000Z0%
2026-10-13T20:00:00.000Z0%
2026-10-13T21:00:00.000Z0%
How to read this forecast

The next 24 hours use calculated local darkness and a retained aurora activity heuristic. They are not a measured or statistically calibrated chance of seeing aurora. Aggregate cloud cover is held constant unless a timed weather forecast is available.

Generated 2026-10-12T21:59:41.275Z. Kp: fresh · observation 2026-10-12T21:00:00.000Z. Cloud: fresh · cache refresh 2026-10-12T19:45:40.098+00:00. Overall model: estimated.

Window: No suitable viewing window. A dash marks a missing input; zero means the model found no visibility under the supplied conditions.

27-Day Forecast

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Oct 13

Kp Index •••
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Oct 14

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Oct 15

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About Aurora Viewing in Castelo Branco

Castelo Branco, Portugal, is at 39.8°N. Aurora visibility depends on local conditions as well as geomagnetic activity. Its verified magnetic latitude is 31.4°N; Kp 7–9 is an approximate screening range, not a visibility probability. Sightings at this latitude are unusual and should not be expected on a typical night. Find a dark, open northern horizon and check the sky before travelling.

Follow forecasts, cloud maps and aurora alerts for Castelo Branco in Aurora Hunt, then confirm darkness, local cloud and access before going outside.

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Frequently Asked Questions

Can you see aurora in Castelo Branco tonight?
Aurora visibility in Castelo Branco depends on geomagnetic activity (Kp index), cloud cover, and darkness. At 39.8°N latitude, Castelo Branco typically needs a Kp index of 7–9 for visible aurora. Check the real-time forecast above for tonight's conditions.
What time is best to see northern lights in Castelo Branco?
The best time to see aurora in Castelo Branco is typically between 10 PM and 2 AM local time, when skies are darkest. Aurora can appear any time after astronomical twilight, but peak activity usually occurs around local midnight.
Where to watch aurora in Castelo Branco?
For the best aurora viewing in Castelo Branco, find a location away from city light pollution with a clear view to the north. Dark areas outside the city center, elevated viewpoints, and spots near water are ideal. Check cloud cover before heading out.
What Kp index is needed to see aurora in Castelo Branco?
Castelo Branco is at 39.8°N latitude and typically requires a Kp index of 7–9 for visible aurora. Higher Kp values mean stronger geomagnetic storms and better aurora visibility, even at lower latitudes.
Is Castelo Branco, Portugal a good place to see northern lights?
Castelo Branco can see aurora during strong geomagnetic storms. Located at 39.8°N, aurora is visible when Kp index reaches 7–9 or higher.

Nearby Aurora Destinations

Guarda

40.5°N View →

Coimbra

40.2°N View →

Viseu

40.7°N View →

Leiria

39.7°N View →

Never Miss the Aurora in Castelo Branco

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