Winter nights in Saint-Joachim are milder than in 88% of mainland French towns
The warmest part of a July day comes in at 24.4°C on average. Expect the heaviest rain in December and the lightest in July. By warm days alone, it ranks cooler than 81% of mainland French towns. Frost greets about 27 mornings a year, so leave time to clear the car.
These are the figures of Météo-France’s Saint-Nazaire-Montoir station, 7.8 km south-east.
A year in Saint-Joachim at a glance
Each month’s typical high and low in °C, at the Saint-Nazaire-Montoir station.
What a year in Saint-Joachim feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Nazaire-Montoir.
About 792 mm of rain a year
December is the wettest month and July the driest. About 24 days a year bring 10 mm or more. 62nd wettest of 133 towns of 2,500+ in Loire-Atlantique.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Saint-Nazaire-Montoir
27 frosts and 40 days of 25°C a year
On about 27 nights a year the air drops to 0°C or below, and on about under 1 days it stays below freezing all day. About 40 days a year reach 25°C, and 9 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Nazaire-Montoir: 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 Saint-Nazaire-Montoir
Saint-Nazaire-Montoir is 7.8 km south-east of Saint-Joachim. Every figure on this page is the station’s, not a measurement in Saint-Joachim itself.
| Station (Météo-France number) | Saint-Nazaire-Montoir (44103001) |
| Distance from the town | 7.8 km south-east |
| Station altitude | 3 m |
| Town altitude (its center) | 2 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-Joachim 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-Joachim | Saint-Nazaire-Montoir | 24.4°C | 3.7°C | 792 mm |
| Saint-Malo-de-Guersac 3.2 km | same station | 24.4°C about the same | 3.7°C about the same | 792 mm |
| Crossac 4.7 km | same station | 24.4°C about the same | 3.7°C about the same | 792 mm |
| Montoir-de-Bretagne 6.6 km | same station | 24.4°C about the same | 3.7°C about the same | 792 mm |
| Trignac 8 km | same station | 24.4°C about the same | 3.7°C about the same | 792 mm |
| La Chapelle-des-Marais 8.3 km | Herbignac | 24.6°C about the same | 3.6°C about the same | 886 mm |
| Besné 8.8 km | same station | 24.4°C about the same | 3.7°C about the same | 792 mm |
Saint-Joachim weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Nazaire-Montoir station.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.5°C | 3.7°C | 6.6°C | 88 mm | 73 |
| February | 10.4°C | 3.4°C | 6.9°C | 68 mm | 102 |
| March | 13.2°C | 5.1°C | 9.1°C | 59 mm | 149 |
| April | 15.8°C | 6.6°C | 11.2°C | 57 mm | 175 |
| May | 19.2°C | 9.8°C | 14.5°C | 55 mm | 207 |
| June | 22.5°C | 12.5°C | 17.5°C | 40 mm | 233 |
| July | 24.4°C | 14.1°C | 19.3°C | 39 mm | 233 |
| August | 24.5°C | 13.9°C | 19.2°C | 44 mm | 234 |
| September | 21.9°C | 11.4°C | 16.7°C | 63 mm | 198 |
| October | 17.4°C | 9.5°C | 13.5°C | 88 mm | 128 |
| November | 13.1°C | 6.1°C | 9.6°C | 95 mm | 90 |
| December | 10.2°C | 4.0°C | 7.1°C | 97 mm | 72 |
| Year | 16.8°C | 8.3°C | 12.6°C | 792 mm | 1,893 |
Where Saint-Joachim’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Nazaire-Montoir, 7.8 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, Saint-Nazaire-Montoir, 7.8 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-Joachim’s climate
How warm does Saint-Joachim get in summer?
August is the warmest month, with average highs of 24.5°C. About 40 days a year reach 25°C, fewer than 81% of mainland French towns, and about 9 reach 30°C.
How cold does Saint-Joachim get in winter?
February nights average 3.4°C. The air drops to 0°C or below on about 27 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Saint-Joachim get?
About 792 mm a year, more than 59% of mainland French towns. December is the wettest month (97 mm) and July the driest (39 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Saint-Nazaire-Montoir (7.8 km away), averages 1,893 hours of sunshine a year.
Are these figures for Saint-Joachim itself?
No: they are the normals of the Météo-France station matched to Saint-Joachim, Saint-Nazaire-Montoir, 7.8 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 ST NAZAIRE-MONTOIR, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Saint-Joachim →
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.