Tréhorenteuc gets fewer days of 25 degrees or more than 85% of mainland French towns
Midwinter brings lows of about 3.3°C. In January, nights here are milder than in 80% of mainland French towns. The gap between a January night and a July afternoon is 21°C. Frost greets about 33 mornings a year, so leave time to clear the car.
Figures from Météo-France’s Ploërmel station, 10 km south-west.
A year in Tréhorenteuc at a glance
Each month’s typical high and low in °C, at the Ploërmel station.
What a year in Tréhorenteuc feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Ploërmel.
About 767 mm of rain a year
December is the wettest month and July the driest. About 22 days a year bring 10 mm or more. 82nd wettest of 88 towns of 2,500+ in Morbihan.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Rennes-Saint-Jacques
33 frosts and 37 days of 25°C a year
On about 33 nights a year the air drops to 0°C or below, and on about under 1 days it stays below freezing all day. About 37 days a year reach 25°C, and 7 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Ploërmel: 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 Ploërmel
Ploërmel is 10 km south-west of Tréhorenteuc. Every figure on this page is the station’s, not a measurement in Tréhorenteuc itself.
| Station (Météo-France number) | Ploërmel (56165003) |
| Distance from the town | 10 km south-west |
| Station altitude | 65 m |
| Town altitude (its center) | 86 m |
| Period | 1991–2020 |
| Sunshine measured at | Rennes-Saint-Jacques, 42 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 Tréhorenteuc 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 Morbihan.
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 |
|---|---|---|---|---|
| Tréhorenteuc | Ploërmel | 24.2°C | 3.3°C | 767 mm |
| Mauron 8 km | same station | 24.2°C about the same | 3.3°C about the same | 767 mm |
| Ploërmel 12 km | same station | 24.2°C about the same | 3.3°C about the same | 767 mm |
| Plélan-le-Grand 15 km | Guer | 25.4°C 1.2°C warmer | 2.9°C about the same | 873 mm |
| Guer 16 km | Guer | 25.4°C 1.2°C warmer | 2.9°C about the same | 873 mm |
| Val d'Oust 19 km | same station | 24.2°C about the same | 3.3°C about the same | 767 mm |
| Josselin 20 km | same station | 24.2°C about the same | 3.3°C about the same | 767 mm |
Tréhorenteuc weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Ploërmel station; sunshine at Rennes-Saint-Jacques.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.0°C | 3.3°C | 6.2°C | 84 mm | 68 |
| February | 10.0°C | 3.0°C | 6.5°C | 63 mm | 93 |
| March | 12.7°C | 4.3°C | 8.5°C | 53 mm | 134 |
| April | 15.5°C | 5.5°C | 10.5°C | 58 mm | 174 |
| May | 18.8°C | 8.6°C | 13.7°C | 58 mm | 202 |
| June | 21.9°C | 11.4°C | 16.7°C | 53 mm | 213 |
| July | 24.2°C | 13.1°C | 18.6°C | 40 mm | 220 |
| August | 24.3°C | 13.0°C | 18.7°C | 47 mm | 207 |
| September | 21.5°C | 10.7°C | 16.1°C | 57 mm | 181 |
| October | 16.8°C | 8.9°C | 12.8°C | 81 mm | 117 |
| November | 12.4°C | 5.7°C | 9.1°C | 85 mm | 84 |
| December | 9.5°C | 3.6°C | 6.6°C | 89 mm | 69 |
| Year | 16.4°C | 7.6°C | 12.0°C | 767 mm | 1,762 |
Where Tréhorenteuc’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Ploërmel, 10 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, Rennes-Saint-Jacques, 42 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 Morbihan.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Tréhorenteuc’s climate
How warm does Tréhorenteuc get in summer?
August is the warmest month, with average highs of 24.3°C. About 37 days a year reach 25°C, fewer than 85% of mainland French towns, and about 7 reach 30°C.
How cold does Tréhorenteuc get in winter?
February nights average 3.0°C. The air drops to 0°C or below on about 33 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Tréhorenteuc get?
About 767 mm a year, more than 53% of mainland French towns. December is the wettest month (89 mm) and July the driest (40 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Rennes-Saint-Jacques (42 km away), averages 1,762 hours of sunshine a year.
Are these figures for Tréhorenteuc itself?
No: they are the normals of the Météo-France station matched to Tréhorenteuc, Ploërmel, 10 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 PLOERMEL, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Tréhorenteuc →
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.