Auvergne-Rhône-Alpes

Northern lights in Grenoble tonight

Real-time aurora forecast for Grenoble (Auvergne-Rhône-Alpes) - latitude 45.19° N, estimated Kp threshold 8.

Kp index

4.3

unsettled

Hemispheric power

North21GW

South22GW

Source: app.pulsar-si.com

Tonight in Grenoble

Very unlikely

Based on Kp 4.3 and Grenoble's latitude.

Seeing the northern lights from Grenoble

Grenoble, at 45.2° N, is flanked by three Alpine massifs (Chartreuse, Vercors, Belledonne). Observation from the valley floor is tough: horizons blocked on 270°. But the mountains are a decisive advantage: a few minutes by car or cable-car reach altitudes where the sky is incomparable. Sites like Chamrousse or Col du Coq offer a clear northern horizon over the city's lights.

Observation conditions in Grenoble

Grenoble city is rated Bortle 6, with light pollution amplified by the basin. The Chartreuse (Col de Porte, Bortle 4, 20 km) and the Vercors (Bortle 3, 40 km south-west) give access to exceptional skies within an hour's drive. Higher up, summer alpine pastures reach Bortle 2. Beware of mountain weather: orographic clouds in the evening, thermal contrast. The foehn wind can turn an overcast evening into a transparent sky.

Recent auroras from Grenoble

10-11 May 2024 (Kp 9): colourful aurora photographed from Chamrousse, Col de Porte and the Vercors plateau. 24 March 2024 (Kp 8): aurora visible from Belledonne alpine pastures.

What Grenoble asks of the sky

Geomagnetic latitude

46.3°

32 of 40

Kp index required

Kp 8

2 / 12 months

Dark nights per year

365

365 / 365

Grenoble ranks 32 of the 40 cities we track, at 46.3° geomagnetic. Saint-Étienne sits 0.5° higher , Bayonne follows at 45.8°.

The threshold to clear here is Kp 8. Twelve months of archive hold 2 nights, the most recent on 19 January 2026, and 48 since 1994. Lyon and Saint-Étienne share exactly the same threshold.

Grenoble keeps full astronomical night all 365 nights of the year, which every city north of the Loire loses for part of the summer.

How to read the Kp index →

Local conditions

Light pollution

Bortle 7 of 9

SQM 18.50 mag/arcsec²

Nearest darker sky

Grenoble

2 km · Bortle 3

Kp forecast, next 3 days

Source: app.pulsar-si.com. For an aurora to be visible from Grenoble, Kp must exceed 8.

Wed 19 Aug

1.1

Expected max Kp

Thu 20 Aug

1.5

Expected max Kp

Fri 21 Aug

1.7

Expected max Kp

Frequently asked questions

Can you see the northern lights from Grenoble?

Yes, but rarely. Typically a Kp index of ≥ 8 is needed for the aurora to become visible from Grenoble (latitude 45.2° N). Major geomagnetic storms (Kp 8-9) that reach this latitude happen only a handful of times per 11-year solar cycle.

What Kp index is needed to see auroras from Grenoble?

The approximate Kp threshold for Grenoble is 8. Below that, auroras stay confined to high latitudes (Norway, Scotland). Above it, they gradually extend southward. A Kp of 9 gives a fair chance, 10 a strong one.

When is the best time to watch from Grenoble?

Auroras are a nighttime phenomenon, best observed between roughly 10 PM and 2 AM local time, when the geomagnetic pole is tilted towards the Earth's night side. In practice, peaks depend on when a coronal mass ejection arrives - activity can spike at any hour.

Where around Grenoble offers better conditions?

Move at least 40-60 km north of Grenoble to escape urban light pollution and gain 1-2 magnitudes of limiting magnitude.

Nearby cities

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