Gujan-Mestras is wetter than 83% of mainland French towns: 948 mm of rain a year
Deep winter brings January lows near 2.9°C. Temperatures cover 24°C across the year, low to high. By January nights alone, it runs milder than 72% of mainland French towns. Waterproofs come out on about 125 days a year, each with 1 mm of rain or more.
These are the figures of Météo-France’s Cazaux station, 12 km south.
A year in Gujan-Mestras at a glance
Each month’s typical high and low in °C, at the Cazaux station.
What a year in Gujan-Mestras feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Cazaux.
About 948 mm of rain a year
November is the wettest month and July the driest. About 31 days a year bring 10 mm or more. 11th wettest of 113 towns of 2,500+ in Gironde.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Cazaux
35 frosts and 71 days of 25°C a year
On about 35 nights a year the air drops to 0°C or below, and on about under 1 days it stays below freezing all day. About 71 days a year reach 25°C, and 21 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Cazaux: 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 Cazaux
Cazaux is 12 km south of Gujan-Mestras. Every figure on this page is the station’s, not a measurement in Gujan-Mestras itself.
| Station (Météo-France number) | Cazaux (33529001) |
| Distance from the town | 12 km south |
| Station altitude | 23 m |
| Town altitude (its center) | 6 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 Gujan-Mestras 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 Gironde.
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 |
|---|---|---|---|---|
| Gujan-Mestras | Cazaux | 26.2°C | 2.9°C | 948 mm |
| Le Teich 4.1 km | same station | 26.2°C about the same | 2.9°C about the same | 948 mm |
| La Teste-de-Buch 5.9 km | same station | 26.2°C about the same | 2.9°C about the same | 948 mm |
| Arcachon 7.6 km | same station | 26.2°C about the same | 2.9°C about the same | 948 mm |
| Biganos 8.8 km | same station | 26.2°C about the same | 2.9°C about the same | 948 mm |
| Audenge 8.9 km | same station | 26.2°C about the same | 2.9°C about the same | 948 mm |
| Lanton 9.9 km | same station | 26.2°C about the same | 2.9°C about the same | 948 mm |
Gujan-Mestras weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Cazaux station.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 11.2°C | 2.9°C | 7.1°C | 99 mm | 97 |
| February | 12.4°C | 2.6°C | 7.5°C | 74 mm | 117 |
| March | 15.6°C | 4.8°C | 10.2°C | 67 mm | 174 |
| April | 17.7°C | 7.0°C | 12.4°C | 73 mm | 199 |
| May | 21.2°C | 10.6°C | 15.9°C | 63 mm | 229 |
| June | 24.2°C | 13.7°C | 18.9°C | 66 mm | 244 |
| July | 26.2°C | 15.4°C | 20.8°C | 44 mm | 256 |
| August | 26.7°C | 15.2°C | 21.0°C | 61 mm | 250 |
| September | 24.1°C | 12.3°C | 18.2°C | 76 mm | 214 |
| October | 19.9°C | 9.8°C | 14.9°C | 88 mm | 153 |
| November | 14.7°C | 6.0°C | 10.4°C | 128 mm | 100 |
| December | 11.7°C | 3.7°C | 7.7°C | 109 mm | 89 |
| Year | 18.8°C | 8.7°C | 13.7°C | 948 mm | 2,121 |
Where Gujan-Mestras’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Cazaux, 12 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, Cazaux, 12 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 Gironde.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Gujan-Mestras’s climate
How warm does Gujan-Mestras get in summer?
August is the warmest month, with average highs of 26.7°C. About 71 days a year reach 25°C, more than 65% of mainland French towns, and about 21 reach 30°C.
How cold does Gujan-Mestras get in winter?
February nights average 2.6°C. The air drops to 0°C or below on about 35 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Gujan-Mestras get?
About 948 mm a year, more than 83% of mainland French towns. November is the wettest month (128 mm) and July the driest (44 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Cazaux (12 km away), averages 2,121 hours of sunshine a year.
Are these figures for Gujan-Mestras itself?
No: they are the normals of the Météo-France station matched to Gujan-Mestras, Cazaux, 12 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 CAZAUX, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Gujan-Mestras →
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.