Saint-Joseph gets more frosts than 86% of mainland French towns
July afternoons average 28.1°C. Of all months, October brings the most rain and February the least. Summer afternoons here are warmer than in 79% of mainland French towns. Wet days, with 1 mm of rain or more, come about 106 times a year.
Figures from Météo-France’s Mornant station, 8.3 km north-east.
A year in Saint-Joseph at a glance
Each month’s typical high and low in °C, at the Mornant station.
What a year in Saint-Joseph feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Mornant.
About 759 mm of rain a year
October is the wettest month and February the driest. About 22 days a year bring 10 mm or more. 12th wettest of 53 towns of 2,500+ in Loire.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Saint-Étienne-Bouthéon
A frosty town: 65 frosts and 87 days of 25°C a year
On about 65 nights a year the air drops to 0°C or below, and on about 6 days it stays below freezing all day. About 87 days a year reach 25°C, and 33 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Mornant: 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 Mornant
Mornant is 8.3 km north-east of Saint-Joseph. Every figure on this page is the station’s, not a measurement in Saint-Joseph itself.
| Station (Météo-France number) | Mornant (69141001) |
| Distance from the town | 8.3 km north-east |
| Station altitude | 343 m |
| Town altitude (its center) | 326 m |
| Period | 1991–2020 |
| Nearest station of any kind | 6 km |
| Sunshine measured at | Saint-Étienne-Bouthéon, 26 km away |
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-Joseph 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.
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-Joseph | Mornant | 28.1°C | 0.0°C | 759 mm |
| Saint-Martin-la-Plaine 2.2 km | same station | 28.1°C about the same | 0.0°C about the same | 759 mm |
| Rive-de-Gier 2.6 km | same station | 28.1°C about the same | 0.0°C about the same | 759 mm |
| Genilac 4 km | same station | 28.1°C about the same | 0.0°C about the same | 759 mm |
| Chabanière 4.6 km | same station | 28.1°C about the same | 0.0°C about the same | 759 mm |
| Lorette 5.4 km | same station | 28.1°C about the same | 0.0°C about the same | 759 mm |
| La Grand-Croix 7.1 km | same station | 28.1°C about the same | 0.0°C about the same | 759 mm |
Saint-Joseph weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Mornant station; sunshine at Saint-Étienne-Bouthéon.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.0°C | 0.0°C | 3.5°C | 48 mm | 81 |
| February | 8.9°C | 0.2°C | 4.5°C | 35 mm | 109 |
| March | 13.8°C | 2.7°C | 8.2°C | 43 mm | 162 |
| April | 17.3°C | 5.3°C | 11.3°C | 60 mm | 186 |
| May | 21.3°C | 9.2°C | 15.2°C | 71 mm | 214 |
| June | 25.5°C | 12.8°C | 19.2°C | 70 mm | 241 |
| July | 28.1°C | 14.7°C | 21.4°C | 69 mm | 275 |
| August | 27.9°C | 14.4°C | 21.1°C | 62 mm | 259 |
| September | 23.0°C | 10.7°C | 16.8°C | 77 mm | 193 |
| October | 17.5°C | 7.7°C | 12.6°C | 87 mm | 135 |
| November | 11.2°C | 3.4°C | 7.3°C | 86 mm | 88 |
| December | 7.6°C | 0.7°C | 4.2°C | 50 mm | 76 |
| Year | 17.4°C | 6.8°C | 12.1°C | 759 mm | 2,018 |
Where Saint-Joseph’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Mornant, 8.3 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-Étienne-Bouthéon, 26 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.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Saint-Joseph’s climate
How warm does Saint-Joseph get in summer?
July is the warmest month, with average highs of 28.1°C. About 87 days a year reach 25°C, more than 77% of mainland French towns, and about 33 reach 30°C.
How cold does Saint-Joseph get in winter?
January nights average 0.0°C. The air drops to 0°C or below on about 65 nights a year, and about 6 days a year stay below freezing all day.
How much rain does Saint-Joseph get?
About 759 mm a year, more than 51% of mainland French towns. October is the wettest month (87 mm) and February the driest (35 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Saint-Étienne-Bouthéon (26 km away), averages 2,018 hours of sunshine a year.
Are these figures for Saint-Joseph itself?
No: they are the normals of the Météo-France station matched to Saint-Joseph, Mornant, 8.3 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 MORNANT, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Saint-Joseph →
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.