Groix gets fewer days of 25 degrees or more than 94% of mainland French towns
Deep winter brings January lows near 4.0°C. In January, nights here are milder than in 92% of mainland French towns. Rain peaks in December and eases off in June. An umbrella earns its place on about 130 days a year with 1 mm of rain or more.
Figures from Météo-France’s Lorient-Lann Bihoue station, 14 km north.
A year in Groix at a glance
Each month’s typical high and low in °C, at the Lorient-Lann Bihoue station.
What a year in Groix feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Lorient-Lann Bihoue.
About 943 mm of rain a year
December is the wettest month and June the driest. About 29 days a year bring 10 mm or more. 50th wettest of 88 towns of 2,500+ in Morbihan.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Lorient-Lann Bihoue
22 frosts and 23 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 23 days a year reach 25°C, and 3 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Lorient-Lann Bihoue: 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 Lorient-Lann Bihoue
Lorient-Lann Bihoue is 14 km north of Groix. Every figure on this page is the station’s, not a measurement in Groix itself.
| Station (Météo-France number) | Lorient-Lann Bihoue (56185001) |
| Distance from the town | 14 km north |
| Station altitude | 45 m |
| Town altitude (its center) | 41 m |
| Period | 1991–2020 |
| Sunshine measured at | the same station |
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 Groix 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 |
|---|---|---|---|---|
| Groix | Lorient-Lann Bihoue | 22.5°C | 4.0°C | 943 mm |
| Larmor-Plage 9.9 km | same station | 22.5°C about the same | 4.0°C about the same | 943 mm |
| Ploemeur 10 km | same station | 22.5°C about the same | 4.0°C about the same | 943 mm |
| Port-Louis 11 km | same station | 22.5°C about the same | 4.0°C about the same | 943 mm |
| Locmiquélic 13 km | same station | 22.5°C about the same | 4.0°C about the same | 943 mm |
| Riantec 13 km | same station | 22.5°C about the same | 4.0°C about the same | 943 mm |
| Lorient 14 km | same station | 22.5°C about the same | 4.0°C about the same | 943 mm |
Groix weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Lorient-Lann Bihoue station.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.7°C | 4.0°C | 6.9°C | 109 mm | 71 |
| February | 10.4°C | 3.8°C | 7.1°C | 83 mm | 99 |
| March | 12.6°C | 5.0°C | 8.8°C | 66 mm | 144 |
| April | 15.0°C | 6.4°C | 10.7°C | 68 mm | 191 |
| May | 18.1°C | 9.3°C | 13.7°C | 66 mm | 214 |
| June | 20.8°C | 11.9°C | 16.4°C | 52 mm | 224 |
| July | 22.5°C | 13.6°C | 18.0°C | 55 mm | 232 |
| August | 22.6°C | 13.5°C | 18.1°C | 53 mm | 219 |
| September | 20.7°C | 11.5°C | 16.1°C | 66 mm | 193 |
| October | 16.8°C | 9.7°C | 13.3°C | 104 mm | 120 |
| November | 13.0°C | 6.6°C | 9.8°C | 108 mm | 87 |
| December | 10.4°C | 4.6°C | 7.5°C | 115 mm | 72 |
| Year | 16.0°C | 8.3°C | 12.2°C | 943 mm | 1,865 |
Where Groix’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Lorient-Lann Bihoue, 14 km away: statistics for 1991–2020.
- 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, Lorient-Lann Bihoue, 14 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 Groix’s climate
How warm does Groix get in summer?
August is the warmest month, with average highs of 22.6°C. About 23 days a year reach 25°C, fewer than 94% of mainland French towns, and about 3 reach 30°C.
How cold does Groix get in winter?
February nights average 3.8°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 Groix get?
About 943 mm a year, more than 83% of mainland French towns. December is the wettest month (115 mm) and June the driest (52 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Lorient-Lann Bihoue (14 km away), averages 1,865 hours of sunshine a year.
Are these figures for Groix itself?
No: they are the normals of the Météo-France station matched to Groix, Lorient-Lann Bihoue, 14 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 LORIENT-LANN BIHOUE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Groix →
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.