Winter nights in Carnac are milder than in 93% of mainland French towns
Sunny July days climb to about 23.6°C. Days of 25°C are scarce: about 32 a year, fewer than in 90% of mainland French towns. Expect the heaviest rain in December and the lightest in July. Plan time outside from May to October, when highs sit at 18–24°C.
Figures from Météo-France’s Auray station, 11 km north-east.
A year in Carnac at a glance
Each month’s typical high and low in °C, at the Auray station.
What a year in Carnac feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Auray.
About 969 mm of rain a year
December is the wettest month and July the driest. About 31 days a year bring 10 mm or more. 30th wettest of 88 towns of 2,500+ in Morbihan.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Vannes-Séné
22 frosts and 32 days of 25°C a year
On about 22 nights a year the air drops to 0°C or below; days that stay below freezing are rare. About 32 days a year reach 25°C, and 5 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Auray: a frost is a night of 0°C or below, a summer day (jour d’été) 25°C or more, a hot day (forte chaleur) 30°C or more.
The Météo-France station at Auray
Auray is 11 km north-east of Carnac. Every figure on this page is the station’s, not a measurement in Carnac itself.
| Station (Météo-France number) | Auray (56007001) |
| Distance from the town | 11 km north-east |
| Station altitude | 26 m |
| Town altitude (its center) | 21 m |
| Period | 1994–2020 (the station’s own record) |
| Sunshine measured at | Vannes-Séné, 27 km away |
TownRatings matches each commune to one station with at least 24 years of temperature and rain records: the nearest, counting every 100 m of height difference as 10 km, never across the sea.
How Carnac compares
Against the 4,385 towns of 2,500 or more in mainland France, each read from its own matched station. The dots are the other towns of 2,500+ in Morbihan.
Nearby towns’ climate
The nearest towns of 2,500+ within 29 km. Where a neighbor uses the same station its figures are the same: the differences you’d feel over a few kilometers aren’t in the normals.
| Town | Station | July high | January low | Rain a year |
|---|---|---|---|---|
| Carnac | Auray | 23.6°C | 4.2°C | 969 mm |
| Crach 7.1 km | same station | 23.6°C about the same | 4.2°C about the same | 969 mm |
| Ploemel 7.1 km | same station | 23.6°C about the same | 4.2°C about the same | 969 mm |
| Erdeven 8.3 km | same station | 23.6°C about the same | 4.2°C about the same | 969 mm |
| Auray 11 km | same station | 23.6°C about the same | 4.2°C about the same | 969 mm |
| Le Bono 11 km | same station | 23.6°C about the same | 4.2°C about the same | 969 mm |
| Belz 12 km | same station | 23.6°C about the same | 4.2°C about the same | 969 mm |
Carnac weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Auray station; sunshine at Vannes-Séné.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.9°C | 4.2°C | 7.0°C | 110 mm | 75 |
| February | 10.8°C | 4.1°C | 7.4°C | 83 mm | 107 |
| March | 13.2°C | 5.2°C | 9.2°C | 68 mm | 157 |
| April | 15.8°C | 6.8°C | 11.3°C | 70 mm | 201 |
| May | 18.8°C | 9.8°C | 14.3°C | 64 mm | 222 |
| June | 21.7°C | 12.5°C | 17.1°C | 54 mm | 244 |
| July | 23.6°C | 14.1°C | 18.8°C | 51 mm | 255 |
| August | 23.5°C | 13.9°C | 18.7°C | 55 mm | 225 |
| September | 21.4°C | 11.8°C | 16.6°C | 72 mm | 202 |
| October | 17.5°C | 10.1°C | 13.8°C | 107 mm | 121 |
| November | 13.4°C | 6.7°C | 10.0°C | 115 mm | 93 |
| December | 10.6°C | 4.6°C | 7.6°C | 122 mm | 79 |
| Year | 16.7°C | 8.6°C | 12.6°C | 969 mm | 1,981 |
Where Carnac’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Auray, 11 km away: statistics for 1991–2020 (the station’s own years, 1994–2020, where its record is shorter).
- Which station: among stations with at least 24 of the 30 years of temperature and rain, the nearest to the commune’s population-weighted center, counting each 100 m of height difference as 10 km; mainland towns use mainland stations and each overseas département its own.
- Altitudes: the town’s from IGN’s RGE ALTI® at its population-weighted center; the station’s from Météo-France.
- Sunshine: the nearest station with at least 10 years of sunshine records, Vannes-Séné, 27 km away.
- Comparisons: every town of 2,500 or more in mainland France, read the same way; the dots are the towns of 2,500+ in Morbihan.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Carnac’s climate
How warm does Carnac get in summer?
July is the warmest month, with average highs of 23.6°C. About 32 days a year reach 25°C, fewer than 90% of mainland French towns, and about 5 reach 30°C.
How cold does Carnac get in winter?
February nights average 4.1°C. The air drops to 0°C or below on about 22 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Carnac get?
About 969 mm a year, more than 86% of mainland French towns. December is the wettest month (122 mm) and July the driest (51 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Vannes-Séné (27 km away), averages 1,981 hours of sunshine a year.
Are these figures for Carnac itself?
No: they are the normals of the Météo-France station matched to Carnac, Auray, 11 km away. France publishes its climate normals by station, not by commune; a valley, a hill or the sea can make a difference over a few kilometers.
Where do these figures come from?
Météo-France’s fiches climatologiques: 30-year averages (1991–2020) for each of its long-running stations, published as open data since 2024. They are normals, not a forecast.
Source: Météo-France, fiches climatologiques, 1991–2020 statistics (station AURAY, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Carnac →
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.