Rainfall in Siest tops that of 94% of mainland French towns: 1,155 mm a year
Midwinter brings lows of about 3.3°C. By frosts alone, it ranks gentler than 83% of mainland French towns. Rain peaks in November and eases off in July. Wet days, with 1 mm of rain or more, come about 127 times a year.
These are the figures of Météo-France’s Dax station, 6.9 km north-east.
A year in Siest at a glance
Each month’s typical high and low in °C, at the Dax station.
What a year in Siest feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Dax.
About 1,155 mm of rain a year
November is the wettest month and July the driest. About 39 days a year bring 10 mm or more. 13th wettest of 35 towns of 2,500+ in Landes.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Dax
26 frosts and 89 days of 25°C a year
On about 26 nights a year the air drops to 0°C or below; days that stay below freezing are rare. About 89 days a year reach 25°C, and 26 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Dax: 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 Dax
Dax is 6.9 km north-east of Siest. Every figure on this page is the station’s, not a measurement in Siest itself.
| Station (Météo-France number) | Dax (40088001) |
| Distance from the town | 6.9 km north-east |
| Station altitude | 31 m |
| Town altitude (its center) | 12 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 Siest 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 |
|---|---|---|---|---|
| Siest | Dax | 26.9°C | 3.3°C | 1,155 mm |
| Saint-Geours-de-Maremne 8.4 km | same station | 26.9°C about the same | 3.3°C about the same | 1,155 mm |
| Dax 8.8 km | same station | 26.9°C about the same | 3.3°C about the same | 1,155 mm |
| Saint-Paul-lès-Dax 11 km | same station | 26.9°C about the same | 3.3°C about the same | 1,155 mm |
| Narrosse 11 km | same station | 26.9°C about the same | 3.3°C about the same | 1,155 mm |
| Peyrehorade 11 km | Bidache | 26.9°C about the same | 3.2°C about the same | 1,456 mm |
| Pouillon 12 km | same station | 26.9°C about the same | 3.3°C about the same | 1,155 mm |
Siest weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Dax station.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 11.7°C | 3.3°C | 7.5°C | 113 mm | 90 |
| February | 13.2°C | 3.3°C | 8.3°C | 90 mm | 112 |
| March | 16.6°C | 5.8°C | 11.2°C | 86 mm | 163 |
| April | 18.6°C | 8.0°C | 13.3°C | 104 mm | 173 |
| May | 21.9°C | 11.4°C | 16.7°C | 93 mm | 199 |
| June | 24.9°C | 14.6°C | 19.8°C | 74 mm | 208 |
| July | 26.9°C | 16.4°C | 21.6°C | 63 mm | 226 |
| August | 27.5°C | 16.4°C | 21.9°C | 63 mm | 222 |
| September | 24.9°C | 13.4°C | 19.2°C | 89 mm | 197 |
| October | 20.8°C | 10.5°C | 15.6°C | 108 mm | 145 |
| November | 15.0°C | 6.4°C | 10.7°C | 157 mm | 95 |
| December | 12.0°C | 4.0°C | 8.0°C | 117 mm | 84 |
| Year | 19.5°C | 9.5°C | 14.5°C | 1,155 mm | 1,914 |
Where Siest’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Dax, 6.9 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, Dax, 6.9 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 Siest’s climate
How warm does Siest get in summer?
August is the warmest month, with average highs of 27.5°C. About 89 days a year reach 25°C, more than 80% of mainland French towns, and about 26 reach 30°C.
How cold does Siest get in winter?
January nights average 3.3°C. The air drops to 0°C or below on about 26 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Siest get?
About 1,155 mm a year, more than 94% of mainland French towns. November is the wettest month (157 mm) and July the driest (63 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Dax (6.9 km away), averages 1,914 hours of sunshine a year.
Are these figures for Siest itself?
No: they are the normals of the Météo-France station matched to Siest, Dax, 6.9 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 DAX, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Siest →
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.