For weather, Port-Brillet is about as ordinary as mainland French towns get
January nights average 2.5°C, July afternoons 25.4°C, and a year brings 796 mm of rain. In July, afternoons here are cooler than in 66% of mainland French towns. The rainiest month is December; the driest is July. Radiators earn their keep from November to March, the months that average under 10°C.
Figures from Météo-France’s Cossé-le-Vivien station, 17 km south.
A year in Port-Brillet at a glance
Each month’s typical high and low in °C, at the Cossé-le-Vivien station.
What a year in Port-Brillet feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Cossé-le-Vivien.
About 796 mm of rain a year
December is the wettest month and July the driest. About 22 days a year bring 10 mm or more. 8th wettest of 19 towns of 2,500+ in Mayenne.
Rain by month
Millimeters
43 frosts and 54 days of 25°C a year
On about 43 nights a year the air drops to 0°C or below, and on about 2 days it stays below freezing all day. About 54 days a year reach 25°C, and 13 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Cossé-le-Vivien: 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 Cossé-le-Vivien
Cossé-le-Vivien is 17 km south of Port-Brillet. Every figure on this page is the station’s, not a measurement in Port-Brillet itself.
| Station (Météo-France number) | Cossé-le-Vivien (53077001) |
| Distance from the town | 17 km south |
| Station altitude | 95 m |
| Town altitude (its center) | 140 m |
| Period | 1991–2020 |
| Nearest station of any kind | 4.7 km |
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 Port-Brillet 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 Mayenne.
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 |
|---|---|---|---|---|
| Port-Brillet | Cossé-le-Vivien | 25.4°C | 2.5°C | 796 mm |
| Loiron-Ruillé 6.1 km | same station | 25.4°C about the same | 2.5°C about the same | 796 mm |
| Saint-Berthevin 11 km | Laval-Etronnier | 24.6°C 0.8°C cooler | 2.7°C about the same | 757 mm |
| Changé 14 km | Laval-Etronnier | 24.6°C 0.8°C cooler | 2.7°C about the same | 757 mm |
| Argentré-du-Plessis 15 km | same station | 25.4°C about the same | 2.5°C about the same | 796 mm |
| Laval 15 km | Laval-Etronnier | 24.6°C 0.8°C cooler | 2.7°C about the same | 757 mm |
| Vitré 18 km | Fougères | 23.3°C 2.1°C cooler | 3.2°C 0.7°C milder | 939 mm |
Port-Brillet weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Cossé-le-Vivien station.
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 8.7°C | 2.5°C | 5.6°C | 78 mm |
| February | 9.9°C | 2.0°C | 6.0°C | 65 mm |
| March | 13.2°C | 3.7°C | 8.4°C | 57 mm |
| April | 16.2°C | 5.3°C | 10.7°C | 59 mm |
| May | 19.7°C | 8.6°C | 14.1°C | 59 mm |
| June | 23.1°C | 11.4°C | 17.3°C | 56 mm |
| July | 25.4°C | 12.9°C | 19.2°C | 48 mm |
| August | 25.6°C | 12.9°C | 19.2°C | 51 mm |
| September | 22.2°C | 10.4°C | 16.3°C | 65 mm |
| October | 17.2°C | 8.3°C | 12.7°C | 84 mm |
| November | 12.1°C | 4.9°C | 8.5°C | 83 mm |
| December | 9.1°C | 2.8°C | 5.9°C | 92 mm |
| Year | 16.9°C | 7.1°C | 12.0°C | 796 mm |
Where Port-Brillet’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Cossé-le-Vivien, 17 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.
- Comparisons: every town of 2,500 or more in mainland France, read the same way; the dots are the towns of 2,500+ in Mayenne.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Port-Brillet’s climate
How warm does Port-Brillet get in summer?
August is the warmest month, with average highs of 25.6°C. About 54 days a year reach 25°C, fewer than 64% of mainland French towns, and about 13 reach 30°C.
How cold does Port-Brillet get in winter?
February nights average 2.0°C. The air drops to 0°C or below on about 43 nights a year, and about 2 days a year stay below freezing all day.
How much rain does Port-Brillet get?
About 796 mm a year, more than 59% of mainland French towns. December is the wettest month (92 mm) and July the driest (48 mm).
Are these figures for Port-Brillet itself?
No: they are the normals of the Météo-France station matched to Port-Brillet, Cossé-le-Vivien, 17 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 COSSE-LE-VIVIEN, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Port-Brillet →
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.