Hardly any mainland French towns collect more rain than Tarnos: 1,474 mm a year
January mornings start at about 5.0°C. The rainiest month is November; the driest is July. Of the 35 towns of 2,500+ in Landes, it has the mildest January nights. Wet days, with 1 mm of rain or more, come about 141 times a year.
These are the figures of Météo-France’s Biarritz-Pays-Basque station, 9.6 km south-west.
A year in Tarnos at a glance
Each month’s typical high and low in °C, at the Biarritz-Pays-Basque station.
What a year in Tarnos feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Biarritz-Pays-Basque.
About 1,474 mm of rain a year
November is the wettest month and July the driest. About 50 days a year bring 10 mm or more. The wettest of 35 towns of 2,500+ in Landes.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Biarritz-Pays-Basque
15 frosts and 50 days of 25°C a year
On about 15 nights a year the air drops to 0°C or below; days that stay below freezing are rare. About 50 days a year reach 25°C, and 12 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Biarritz-Pays-Basque: 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 Biarritz-Pays-Basque
Biarritz-Pays-Basque is 9.6 km south-west of Tarnos. Every figure on this page is the station’s, not a measurement in Tarnos itself.
| Station (Météo-France number) | Biarritz-Pays-Basque (64024001) |
| Distance from the town | 9.6 km south-west |
| Station altitude | 71 m |
| Town altitude (its center) | 35 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 Tarnos 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 |
|---|---|---|---|---|
| Tarnos | Biarritz-Pays-Basque | 24.2°C | 5.0°C | 1,474 mm |
| Boucau 2 km | same station | 24.2°C about the same | 5.0°C about the same | 1,474 mm |
| Ondres 3.1 km | Saint-M Hinx Stna-Inrae | 26.2°C 2°C warmer | 3.3°C 1.7°C colder | 1,410 mm |
| Bayonne 5.2 km | same station | 24.2°C about the same | 5.0°C about the same | 1,474 mm |
| Saint-Martin-de-Seignanx 6.1 km | Saint-M Hinx Stna-Inrae | 26.2°C 2°C warmer | 3.3°C 1.7°C colder | 1,410 mm |
| Labenne 6.6 km | Soorts-Hossegor | 26.5°C 2.3°C warmer | 4.0°C 1°C colder | 1,182 mm |
| Anglet 6.8 km | same station | 24.2°C about the same | 5.0°C about the same | 1,474 mm |
Tarnos weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Biarritz-Pays-Basque station.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 12.2°C | 5.0°C | 8.6°C | 140 mm | 96 |
| February | 12.8°C | 4.9°C | 8.9°C | 110 mm | 115 |
| March | 15.2°C | 7.1°C | 11.2°C | 103 mm | 163 |
| April | 16.8°C | 8.8°C | 12.8°C | 118 mm | 171 |
| May | 19.9°C | 11.9°C | 15.9°C | 116 mm | 197 |
| June | 22.5°C | 14.9°C | 18.7°C | 99 mm | 206 |
| July | 24.2°C | 16.9°C | 20.6°C | 77 mm | 219 |
| August | 25.1°C | 17.2°C | 21.2°C | 88 mm | 214 |
| September | 23.3°C | 14.5°C | 18.9°C | 118 mm | 199 |
| October | 20.2°C | 11.9°C | 16.1°C | 147 mm | 145 |
| November | 15.4°C | 7.9°C | 11.6°C | 207 mm | 103 |
| December | 12.9°C | 5.7°C | 9.3°C | 151 mm | 92 |
| Year | 18.4°C | 10.6°C | 14.5°C | 1,474 mm | 1,921 |
Where Tarnos’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Biarritz-Pays-Basque, 9.6 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, Biarritz-Pays-Basque, 9.6 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 Landes.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Tarnos’s climate
How warm does Tarnos get in summer?
August is the warmest month, with average highs of 25.1°C. About 50 days a year reach 25°C, fewer than 69% of mainland French towns, and about 12 reach 30°C.
How cold does Tarnos get in winter?
February nights average 4.9°C. The air drops to 0°C or below on about 15 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Tarnos get?
About 1,474 mm a year, more than almost every mainland French town. November is the wettest month (207 mm) and July the driest (77 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Biarritz-Pays-Basque (9.6 km away), averages 1,921 hours of sunshine a year.
Are these figures for Tarnos itself?
No: they are the normals of the Météo-France station matched to Tarnos, Biarritz-Pays-Basque, 9.6 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 BIARRITZ-PAYS-BASQUE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Tarnos →
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.