Warm afternoons come to Saint-Gein more often than to 89% of mainland French towns
Deep winter brings January lows near 2.3°C. Its yearly rainfall tops that of 87% of mainland French towns. Expect the heaviest rain in November and the lightest in July. Windscreens need scraping on about 37 mornings a year, the nights the air drops below 0°C.
Figures from Météo-France’s Grenade-sur-Ad station, 11 km west.
A year in Saint-Gein at a glance
Each month’s typical high and low in °C, at the Grenade-sur-Ad station.
What a year in Saint-Gein feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Grenade-sur-Ad.
About 1,010 mm of rain a year
November is the wettest month and July the driest. About 34 days a year bring 10 mm or more. 26th wettest of 35 towns of 2,500+ in Landes.
Rain by month
Millimeters
37 frosts and 103 days of 25°C a year
On about 37 nights a year the air drops to 0°C or below, and on about under 1 days it stays below freezing all day. About 103 days a year reach 25°C, and 39 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Grenade-sur-Ad: 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 Grenade-sur-Ad
Grenade-sur-Ad is 11 km west of Saint-Gein. Every figure on this page is the station’s, not a measurement in Saint-Gein itself.
| Station (Météo-France number) | Grenade-sur-Ad (40117001) |
| Distance from the town | 11 km west |
| Station altitude | 72 m |
| Town altitude (its center) | 95 m |
| Period | 1991–2020 |
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 Saint-Gein 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 Landes.
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 |
|---|---|---|---|---|
| Saint-Gein | Grenade-sur-Ad | 28.1°C | 2.3°C | 1,010 mm |
| Villeneuve-de-Marsan 6.3 km | same station | 28.1°C about the same | 2.3°C about the same | 1,010 mm |
| Aire-sur-l'Adour 15 km | same station | 28.1°C about the same | 2.3°C about the same | 1,010 mm |
| Mont-de-Marsan 16 km | Mont-de-Marsan | 27.8°C about the same | 2.1°C about the same | 918 mm |
| Saint-Pierre-du-Mont 17 km | Mont-de-Marsan | 27.8°C about the same | 2.1°C about the same | 918 mm |
| Saint-Sever 23 km | same station | 28.1°C about the same | 2.3°C about the same | 1,010 mm |
Saint-Gein weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Grenade-sur-Ad station.
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 11.0°C | 2.3°C | 6.6°C | 98 mm |
| February | 12.8°C | 2.3°C | 7.5°C | 76 mm |
| March | 16.6°C | 4.6°C | 10.6°C | 78 mm |
| April | 19.0°C | 7.0°C | 13.0°C | 92 mm |
| May | 22.7°C | 10.7°C | 16.7°C | 92 mm |
| June | 26.0°C | 14.0°C | 20.0°C | 72 mm |
| July | 28.1°C | 15.6°C | 21.8°C | 58 mm |
| August | 28.5°C | 15.4°C | 21.9°C | 64 mm |
| September | 25.4°C | 12.2°C | 18.8°C | 78 mm |
| October | 20.7°C | 9.5°C | 15.1°C | 87 mm |
| November | 14.6°C | 5.4°C | 10.0°C | 118 mm |
| December | 11.5°C | 3.0°C | 7.3°C | 99 mm |
| Year | 19.7°C | 8.5°C | 14.1°C | 1,010 mm |
Where Saint-Gein’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Grenade-sur-Ad, 11 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.
- Comparisons: every town of 2,500 or more in mainland France, read the same way; the dots are the towns of 2,500+ in Landes.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Saint-Gein’s climate
How warm does Saint-Gein get in summer?
August is the warmest month, with average highs of 28.5°C. About 103 days a year reach 25°C, more than 89% of mainland French towns, and about 39 reach 30°C.
How cold does Saint-Gein get in winter?
January nights average 2.3°C. The air drops to 0°C or below on about 37 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Saint-Gein get?
About 1,010 mm a year, more than 87% of mainland French towns. November is the wettest month (118 mm) and July the driest (58 mm).
Are these figures for Saint-Gein itself?
No: they are the normals of the Météo-France station matched to Saint-Gein, Grenade-sur-Ad, 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 GRENADE-SUR-AD, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Saint-Gein →
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.