Few mainland French towns have cooler summers than Tréflévénez
January mornings start at about 3.7°C. The rainiest month is December; the driest is June. It is a wet place: more rain falls here than on 98% of mainland French towns. Windscreens need scraping on about 24 mornings a year, the nights the air drops below 0°C.
These are the figures of Météo-France’s Sizun station, 11 km east.
A year in Tréflévénez at a glance
Each month’s typical high and low in °C, at the Sizun station.
What a year in Tréflévénez feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Sizun.
About 1,345 mm of rain a year
December is the wettest month and June the driest. About 46 days a year bring 10 mm or more. 4th wettest of 91 towns of 2,500+ in Finistère.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Landivisiau
24 frosts and 17 days of 25°C a year
On about 24 nights a year the air drops to 0°C or below, and on about under 1 days it stays below freezing all day. About 17 days a year reach 25°C, and 2 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Sizun: 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 Sizun
Sizun is 11 km east of Tréflévénez. Every figure on this page is the station’s, not a measurement in Tréflévénez itself.
| Station (Météo-France number) | Sizun (29277001) |
| Distance from the town | 11 km east |
| Station altitude | 157 m |
| Town altitude (its center) | 139 m |
| Period | 1991–2020 |
| Sunshine measured at | Landivisiau, 13 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 Tréflévénez 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, each with its own matched station.
| Town | Station | July high | January low | Rain a year |
|---|---|---|---|---|
| Tréflévénez | Sizun | 21.1°C | 3.7°C | 1,345 mm |
| Landerneau 7.8 km | Ploudaniel-Inrae | 21.3°C about the same | 4.4°C 0.7°C milder | 1,147 mm |
| Plouédern 9 km | Ploudaniel-Inrae | 21.3°C about the same | 4.4°C 0.7°C milder | 1,147 mm |
| Loperhet 11 km | Brest-Guipavas | 20.8°C about the same | 4.6°C 0.9°C milder | 1,230 mm |
| Landivisiau 13 km | Landivisiau | 20.7°C about the same | 4.4°C 0.7°C milder | 1,160 mm |
| Plougastel-Daoulas 16 km | Brest-Guipavas | 20.8°C about the same | 4.6°C 0.9°C milder | 1,230 mm |
| Ploudaniel 17 km | Ploudaniel-Inrae | 21.3°C about the same | 4.4°C 0.7°C milder | 1,147 mm |
Tréflévénez weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Sizun station; sunshine at Landivisiau.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.9°C | 3.7°C | 6.3°C | 157 mm | 60 |
| February | 9.3°C | 3.4°C | 6.4°C | 132 mm | 74 |
| March | 11.5°C | 4.5°C | 8.0°C | 97 mm | 110 |
| April | 13.8°C | 5.6°C | 9.7°C | 99 mm | 143 |
| May | 16.7°C | 8.2°C | 12.4°C | 82 mm | 171 |
| June | 19.4°C | 10.7°C | 15.1°C | 72 mm | 183 |
| July | 21.1°C | 12.3°C | 16.7°C | 74 mm | 169 |
| August | 21.3°C | 12.5°C | 16.9°C | 82 mm | 165 |
| September | 19.3°C | 10.8°C | 15.1°C | 90 mm | 154 |
| October | 15.6°C | 8.7°C | 12.1°C | 137 mm | 105 |
| November | 11.7°C | 6.0°C | 8.9°C | 153 mm | 68 |
| December | 9.4°C | 4.1°C | 6.8°C | 171 mm | 62 |
| Year | 14.8°C | 7.5°C | 11.2°C | 1,345 mm | 1,463 |
Where Tréflévénez’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Sizun, 11 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, Landivisiau, 13 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 Tréflévénez’s climate
How warm does Tréflévénez get in summer?
August is the warmest month, with average highs of 21.3°C. About 17 days a year reach 25°C, fewer than 97% of mainland French towns, and about 2 reach 30°C.
How cold does Tréflévénez get in winter?
February nights average 3.4°C. The air drops to 0°C or below on about 24 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Tréflévénez get?
About 1,345 mm a year, more than 98% of mainland French towns. December is the wettest month (171 mm) and June the driest (72 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Landivisiau (13 km away), averages 1,463 hours of sunshine a year.
Are these figures for Tréflévénez itself?
No: they are the normals of the Météo-France station matched to Tréflévénez, Sizun, 11 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 SIZUN, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Tréflévénez →
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.