Afternoon heat in Saint-Hernin trails that of 92% of mainland French towns
January mornings start at about 3.2°C. Its yearly rainfall tops that of 92% of mainland French towns. Of all months, December brings the most rain and June the least. An umbrella earns its place on about 154 days a year with 1 mm of rain or more.
Figures from Météo-France’s Carhaix station, 9.6 km north-east.
A year in Saint-Hernin at a glance
Each month’s typical high and low in °C, at the Carhaix station.
What a year in Saint-Hernin feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Carhaix.
About 1,112 mm of rain a year
December is the wettest month and June the driest. About 34 days a year bring 10 mm or more. 57th wettest of 91 towns of 2,500+ in Finistère.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Quimper
39 frosts and 30 days of 25°C a year
On about 39 nights a year the air drops to 0°C or below, and on about under 1 days it stays below freezing all day. About 30 days a year reach 25°C, and 5 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Carhaix: 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 Carhaix
Carhaix is 9.6 km north-east of Saint-Hernin. Every figure on this page is the station’s, not a measurement in Saint-Hernin itself.
| Station (Météo-France number) | Carhaix (29024003) |
| Distance from the town | 9.6 km north-east |
| Station altitude | 150 m |
| Town altitude (its center) | 166 m |
| Period | 1991–2020 |
| Sunshine measured at | Quimper, 49 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-Hernin 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-Hernin | Carhaix | 22.9°C | 3.2°C | 1,112 mm |
| Carhaix-Plouguer 7.6 km | same station | 22.9°C about the same | 3.2°C about the same | 1,112 mm |
| Gourin 8.2 km | Guiscriff | 22.9°C about the same | 3.3°C about the same | 1,366 mm |
| Châteauneuf-du-Faou 16 km | Coray Chat Eau | 21.8°C 1.1°C cooler | 3.3°C about the same | 1,423 mm |
| Le Faouët 22 km | Lanvénégen | 23.7°C 0.8°C warmer | 3.3°C about the same | 1,215 mm |
| Rostrenen 22 km | Rostrenen | 21.7°C 1.2°C cooler | 3.1°C about the same | 1,147 mm |
| Scaër 23 km | Guiscriff | 22.9°C about the same | 3.3°C about the same | 1,366 mm |
Saint-Hernin weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Carhaix station; sunshine at Quimper.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.1°C | 3.2°C | 6.1°C | 132 mm | 66 |
| February | 10.0°C | 2.8°C | 6.4°C | 110 mm | 90 |
| March | 12.5°C | 3.8°C | 8.1°C | 79 mm | 133 |
| April | 15.1°C | 4.8°C | 9.9°C | 81 mm | 177 |
| May | 18.2°C | 7.5°C | 12.9°C | 75 mm | 201 |
| June | 21.1°C | 10.1°C | 15.6°C | 56 mm | 209 |
| July | 22.9°C | 11.9°C | 17.4°C | 59 mm | 205 |
| August | 22.9°C | 11.9°C | 17.4°C | 62 mm | 195 |
| September | 20.6°C | 9.8°C | 15.2°C | 74 mm | 175 |
| October | 16.4°C | 8.1°C | 12.2°C | 112 mm | 112 |
| November | 12.3°C | 5.4°C | 8.8°C | 127 mm | 79 |
| December | 9.6°C | 3.6°C | 6.6°C | 145 mm | 67 |
| Year | 15.9°C | 6.9°C | 11.4°C | 1,112 mm | 1,708 |
Where Saint-Hernin’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Carhaix, 9.6 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, Quimper, 49 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-Hernin’s climate
How warm does Saint-Hernin get in summer?
July is the warmest month, with average highs of 22.9°C. About 30 days a year reach 25°C, fewer than 92% of mainland French towns, and about 5 reach 30°C.
How cold does Saint-Hernin get in winter?
February nights average 2.8°C. The air drops to 0°C or below on about 39 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Saint-Hernin get?
About 1,112 mm a year, more than 92% of mainland French towns. December is the wettest month (145 mm) and June the driest (56 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Quimper (49 km away), averages 1,708 hours of sunshine a year.
Are these figures for Saint-Hernin itself?
No: they are the normals of the Météo-France station matched to Saint-Hernin, Carhaix, 9.6 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 CARHAIX, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Saint-Hernin →
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.