Few mainland French towns have milder winter nights than Arzon
The warmest part of a July day comes in at 23.2°C on average. December is the wettest month, June the driest. Only about 28 days a year reach 25°C, fewer than in 92% of mainland French towns. Warm coats and heating bills mark the months from December to March, when means dip under 10°C.
Figures from Météo-France’s Sarzeau Sa station, 8.6 km south-east.
A year in Arzon at a glance
Each month’s typical high and low in °C, at the Sarzeau Sa station.
What a year in Arzon feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Sarzeau Sa.
About 741 mm of rain a year
December is the wettest month and June the driest. About 22 days a year bring 10 mm or more. 86th wettest of 88 towns of 2,500+ in Morbihan.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Vannes-Séné
16 frosts and 28 days of 25°C a year
On about 16 nights a year the air drops to 0°C or below; days that stay below freezing are rare. About 28 days a year reach 25°C, and 5 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Sarzeau Sa: 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 Sarzeau Sa
Sarzeau Sa is 8.6 km south-east of Arzon. Every figure on this page is the station’s, not a measurement in Arzon itself.
| Station (Météo-France number) | Sarzeau Sa (56240003) |
| Distance from the town | 8.6 km south-east |
| Station altitude | 35 m |
| Town altitude (its center) | 6 m |
| Period | 1995–2020 (the station’s own record) |
| Nearest station of any kind | 4.7 km |
| Sunshine measured at | Vannes-Séné, 15 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 Arzon 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 |
|---|---|---|---|---|
| Arzon | Sarzeau Sa | 23.2°C | 4.5°C | 741 mm |
| Baden 7.4 km | Auray | 23.6°C about the same | 4.2°C about the same | 969 mm |
| Sarzeau 10 km | same station | 23.2°C about the same | 4.5°C about the same | 741 mm |
| Arradon 11 km | Saint-Avé | 24.9°C 1.7°C warmer | 3.6°C 0.9°C colder | 1,034 mm |
| Le Bono 11 km | Auray | 23.6°C about the same | 4.2°C about the same | 969 mm |
| Crach 12 km | Auray | 23.6°C about the same | 4.2°C about the same | 969 mm |
| Plougoumelen 12 km | Auray | 23.6°C about the same | 4.2°C about the same | 969 mm |
Arzon weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Sarzeau Sa station; sunshine at Vannes-Séné.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.5°C | 4.5°C | 7.0°C | 79 mm | 75 |
| February | 10.2°C | 4.4°C | 7.3°C | 65 mm | 107 |
| March | 12.6°C | 5.8°C | 9.2°C | 56 mm | 157 |
| April | 15.3°C | 7.3°C | 11.3°C | 55 mm | 201 |
| May | 18.3°C | 10.2°C | 14.3°C | 47 mm | 222 |
| June | 21.4°C | 12.9°C | 17.1°C | 41 mm | 244 |
| July | 23.2°C | 14.5°C | 18.9°C | 42 mm | 255 |
| August | 23.1°C | 14.5°C | 18.8°C | 47 mm | 225 |
| September | 21.3°C | 12.6°C | 17.0°C | 47 mm | 202 |
| October | 17.2°C | 10.8°C | 14.0°C | 81 mm | 121 |
| November | 13.1°C | 7.4°C | 10.2°C | 89 mm | 93 |
| December | 10.2°C | 5.1°C | 7.6°C | 93 mm | 79 |
| Year | 16.3°C | 9.2°C | 12.7°C | 741 mm | 1,981 |
Where Arzon’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Sarzeau Sa, 8.6 km away: statistics for 1991–2020 (the station’s own years, 1995–2020, 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, 15 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 Arzon’s climate
How warm does Arzon get in summer?
July is the warmest month, with average highs of 23.2°C. About 28 days a year reach 25°C, fewer than 92% of mainland French towns, and about 5 reach 30°C.
How cold does Arzon get in winter?
February nights average 4.4°C. The air drops to 0°C or below on about 16 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Arzon get?
About 741 mm a year, less than 54% of mainland French towns. December is the wettest month (93 mm) and June the driest (41 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Vannes-Séné (15 km away), averages 1,981 hours of sunshine a year.
Are these figures for Arzon itself?
No: they are the normals of the Météo-France station matched to Arzon, Sarzeau Sa, 8.6 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 SARZEAU SA, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Arzon →
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.