Saint-Thurien sits near the top of mainland French towns for rain, with 1,215 mm a year
The depth of winter brings overnight lows near 3.3°C. None of the 91 towns of 2,500+ in Finistère has warmer July afternoons. Winter and summer sit 21°C apart. Frost greets about 42 mornings a year, so leave time to clear the car.
Figures from Météo-France’s Lanvénégen station, 9.7 km east.
A year in Saint-Thurien at a glance
Each month’s typical high and low in °C, at the Lanvénégen station.
What a year in Saint-Thurien feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Lanvénégen.
About 1,215 mm of rain a year
December is the wettest month and June the driest. About 42 days a year bring 10 mm or more. 17th wettest of 91 towns of 2,500+ in Finistère.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Lorient-Lann Bihoue
42 frosts and 40 days of 25°C a year
On about 42 nights a year the air drops to 0°C or below; days that stay below freezing are rare. About 40 days a year reach 25°C, and 8 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Lanvénégen: 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 Lanvénégen
Lanvénégen is 9.7 km east of Saint-Thurien. Every figure on this page is the station’s, not a measurement in Saint-Thurien itself.
| Station (Météo-France number) | Lanvénégen (56105001) |
| Distance from the town | 9.7 km east |
| Station altitude | 97 m |
| Town altitude (its center) | 118 m |
| Period | 1994–2020 (the station’s own record) |
| Sunshine measured at | Lorient-Lann Bihoue, 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-Thurien 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 Finistère.
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-Thurien | Lanvénégen | 23.7°C | 3.3°C | 1,215 mm |
| Bannalec 6.3 km | same station | 23.7°C about the same | 3.3°C about the same | 1,215 mm |
| Mellac 7.6 km | same station | 23.7°C about the same | 3.3°C about the same | 1,215 mm |
| Scaër 9.6 km | Guiscriff | 22.9°C 0.8°C cooler | 3.3°C about the same | 1,366 mm |
| Quimperlé 11 km | Lorient-Lann Bihoue | 22.5°C 1.2°C cooler | 4.0°C 0.7°C milder | 943 mm |
| Le Faouët 13 km | same station | 23.7°C about the same | 3.3°C about the same | 1,215 mm |
| Riec-sur-Bélon 14 km | Lorient-Lann Bihoue | 22.5°C 1.2°C cooler | 4.0°C 0.7°C milder | 943 mm |
Saint-Thurien weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Lanvénégen station; sunshine at Lorient-Lann Bihoue.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.8°C | 3.3°C | 6.6°C | 148 mm | 71 |
| February | 10.8°C | 3.2°C | 7.0°C | 115 mm | 99 |
| March | 13.2°C | 3.9°C | 8.6°C | 84 mm | 144 |
| April | 16.0°C | 5.2°C | 10.6°C | 87 mm | 191 |
| May | 19.1°C | 8.1°C | 13.6°C | 76 mm | 214 |
| June | 22.0°C | 10.9°C | 16.4°C | 61 mm | 224 |
| July | 23.7°C | 12.7°C | 18.2°C | 62 mm | 232 |
| August | 23.8°C | 12.4°C | 18.1°C | 70 mm | 219 |
| September | 21.7°C | 10.2°C | 16.0°C | 76 mm | 193 |
| October | 17.5°C | 8.8°C | 13.1°C | 138 mm | 120 |
| November | 13.2°C | 5.7°C | 9.4°C | 140 mm | 87 |
| December | 10.4°C | 3.8°C | 7.1°C | 159 mm | 72 |
| Year | 16.8°C | 7.3°C | 12.1°C | 1,215 mm | 1,865 |
Where Saint-Thurien’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Lanvénégen, 9.7 km away: statistics for 1991–2020 (the station’s own years, 1994–2020, where its record is shorter).
- 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, Lorient-Lann Bihoue, 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 Finistère.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Saint-Thurien’s climate
How warm does Saint-Thurien get in summer?
August is the warmest month, with average highs of 23.8°C. About 40 days a year reach 25°C, fewer than 80% of mainland French towns, and about 8 reach 30°C.
How cold does Saint-Thurien get in winter?
February nights average 3.2°C. The air drops to 0°C or below on about 42 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Saint-Thurien get?
About 1,215 mm a year, more than 97% of mainland French towns. December is the wettest month (159 mm) and June the driest (61 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Lorient-Lann Bihoue (26 km away), averages 1,865 hours of sunshine a year.
Are these figures for Saint-Thurien itself?
No: they are the normals of the Météo-France station matched to Saint-Thurien, Lanvénégen, 9.7 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 LANVENEGEN, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Saint-Thurien →
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.