Pays de la Loire

Northern lights in Le Mans tonight

Real-time aurora forecast for Le Mans (Pays de la Loire) - latitude 48.01° N, estimated Kp threshold 8.

Kp index

4.3

unsettled

Hemispheric power

North21GW

South22GW

Source: app.pulsar-si.com

Tonight in Le Mans

Very unlikely

Based on Kp 4.3 and Le Mans's latitude.

Seeing the northern lights from Le Mans

Le Mans, at 48° N in the Sarthe department, sits in a plain with no major relief, offering a clear northern horizon. Auroras become visible from Kp 6.5-7. The region benefits from very dark rural areas a short drive from the urban centre, particularly toward the Maine and Mayenne countryside.

Observation conditions in Le Mans

Bortle 7 in the urban area. The Normandie-Maine regional park (Bortle 4-5, 50 km north) and the Bercé and Sillé forests (Bortle 5) offer the best conditions. The Sarthe plain guarantees a widely open horizon in several directions, which is rare in France and valuable for hunting an aurora.

Recent auroras from Le Mans

10-11 May 2024 (Kp 9): clearly visible red aurora across the Sarthe countryside, sightings from the Bercé forest. 24 March 2024 (Kp 8): confirmed rural observations. 5 November 2023 (Kp 7): faint aurora reported in Mayenne.

What Le Mans asks of the sky

Geomagnetic latitude

49.9°

16 of 40

Kp index required

Kp 8

2 / 12 months

Dark nights per year

365

365 / 365

Le Mans ranks 16 of the 40 cities we track, at 49.9° geomagnetic. Metz sits 0.1° higher , Orléans follows at 49.6°.

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. In Rennes, Kp 7 is already enough.

Le Mans 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 18.87 mag/arcsec²

Nearest darker sky

Le Mans

2 km · Bortle 2

Kp forecast, next 3 days

Source: app.pulsar-si.com. For an aurora to be visible from Le Mans, 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 Le Mans?

Yes, but rarely. Typically a Kp index of ≥ 8 is needed for the aurora to become visible from Le Mans (latitude 48.0° 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 Le Mans?

The approximate Kp threshold for Le Mans 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 Le Mans?

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 Le Mans offers better conditions?

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

Nearby cities

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