Nights stay kind in Saint-Herblain each January, milder than in 83% of mainland French towns
On a normal July day the thermometer tops out near 25.1°C. Warm afternoons come less often than in 70% of mainland French towns. A year here swings 22°C from midwinter lows to midsummer highs. The outdoor season runs from May to October, with highs of 18–25°C.
Figures from Météo-France’s Nantes-Bouguenais station, 8.1 km south.
A year in Saint-Herblain at a glance
Each month’s typical high and low in °C, at the Nantes-Bouguenais station.
What a year in Saint-Herblain feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Nantes-Bouguenais.
About 820 mm of rain a year
December is the wettest month and July the driest. About 25 days a year bring 10 mm or more. 39th wettest of 133 towns of 2,500+ in Loire-Atlantique.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Nantes-Bouguenais
29 frosts and 49 days of 25°C a year
On about 29 nights a year the air drops to 0°C or below, and on about 1 days it stays below freezing all day. About 49 days a year reach 25°C, and 12 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Nantes-Bouguenais: 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 Nantes-Bouguenais
Nantes-Bouguenais is 8.1 km south of Saint-Herblain. Every figure on this page is the station’s, not a measurement in Saint-Herblain itself.
| Station (Météo-France number) | Nantes-Bouguenais (44020001) |
| Distance from the town | 8.1 km south |
| Station altitude | 26 m |
| Town altitude (its center) | 50 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 Saint-Herblain 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 Loire-Atlantique.
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-Herblain | Nantes-Bouguenais | 25.1°C | 3.4°C | 820 mm |
| Orvault 4.2 km | same station | 25.1°C about the same | 3.4°C about the same | 820 mm |
| Indre 4.3 km | same station | 25.1°C about the same | 3.4°C about the same | 820 mm |
| Nantes 5 km | same station | 25.1°C about the same | 3.4°C about the same | 820 mm |
| Bouguenais 5.2 km | same station | 25.1°C about the same | 3.4°C about the same | 820 mm |
| Sautron 5.9 km | same station | 25.1°C about the same | 3.4°C about the same | 820 mm |
| La Montagne 6.2 km | same station | 25.1°C about the same | 3.4°C about the same | 820 mm |
Saint-Herblain weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Nantes-Bouguenais station.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.3°C | 3.4°C | 6.4°C | 88 mm | 73 |
| February | 10.5°C | 3.0°C | 6.7°C | 68 mm | 102 |
| March | 13.5°C | 4.9°C | 9.2°C | 58 mm | 147 |
| April | 16.2°C | 6.6°C | 11.4°C | 58 mm | 183 |
| May | 19.6°C | 9.8°C | 14.7°C | 61 mm | 203 |
| June | 23.0°C | 12.7°C | 17.8°C | 49 mm | 213 |
| July | 25.1°C | 14.3°C | 19.7°C | 44 mm | 229 |
| August | 25.4°C | 14.2°C | 19.8°C | 50 mm | 233 |
| September | 22.4°C | 11.8°C | 17.1°C | 60 mm | 199 |
| October | 17.6°C | 9.5°C | 13.5°C | 89 mm | 123 |
| November | 12.9°C | 5.9°C | 9.4°C | 94 mm | 91 |
| December | 9.8°C | 3.7°C | 6.7°C | 101 mm | 78 |
| Year | 17.1°C | 8.3°C | 12.7°C | 820 mm | 1,873 |
Where Saint-Herblain’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Nantes-Bouguenais, 8.1 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, Nantes-Bouguenais, 8.1 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 Loire-Atlantique.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Saint-Herblain’s climate
How warm does Saint-Herblain get in summer?
August is the warmest month, with average highs of 25.4°C. About 49 days a year reach 25°C, fewer than 70% of mainland French towns, and about 12 reach 30°C.
How cold does Saint-Herblain get in winter?
February nights average 3.0°C. The air drops to 0°C or below on about 29 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Saint-Herblain get?
About 820 mm a year, more than 64% of mainland French towns. December is the wettest month (101 mm) and July the driest (44 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Nantes-Bouguenais (8.1 km away), averages 1,873 hours of sunshine a year.
Are these figures for Saint-Herblain itself?
No: they are the normals of the Météo-France station matched to Saint-Herblain, Nantes-Bouguenais, 8.1 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 NANTES-BOUGUENAIS, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Saint-Herblain →
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.