Irvillac has some of the coolest summers among mainland French towns
On a normal January night the air cools to about 4.6°C. Its yearly rainfall tops that of 97% of mainland French towns. The seasons sit close together: from a winter night to a summer afternoon the average spans only 17°C. Keep the boiler serviced for the months from November to March, which average under 10°C.
These are the figures of Météo-France’s Brest-Guipavas station, 16 km north-west.
A year in Irvillac at a glance
Each month’s typical high and low in °C, at the Brest-Guipavas station.
What a year in Irvillac feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Brest-Guipavas.
About 1,230 mm of rain a year
December is the wettest month and June the driest. About 40 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 Brest-Guipavas
14 frosts and 11 days of 25°C a year
On about 14 nights a year the air drops to 0°C or below; days that stay below freezing are rare. About 11 days a year reach 25°C, and under 1 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Brest-Guipavas: 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 Brest-Guipavas
Brest-Guipavas is 16 km north-west of Irvillac. Every figure on this page is the station’s, not a measurement in Irvillac itself.
| Station (Météo-France number) | Brest-Guipavas (29075001) |
| Distance from the town | 16 km north-west |
| Station altitude | 92 m |
| Town altitude (its center) | 87 m |
| Period | 1991–2020 |
| Nearest station of any kind | 14 km |
| Sunshine measured at | the same station |
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 Irvillac 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 |
|---|---|---|---|---|
| Irvillac | Brest-Guipavas | 20.8°C | 4.6°C | 1,230 mm |
| Loperhet 7.5 km | same station | 20.8°C about the same | 4.6°C about the same | 1,230 mm |
| Landerneau 9.9 km | Ploudaniel-Inrae | 21.3°C 0.5°C warmer | 4.4°C about the same | 1,147 mm |
| Plouédern 12 km | Ploudaniel-Inrae | 21.3°C 0.5°C warmer | 4.4°C about the same | 1,147 mm |
| Plougastel-Daoulas 12 km | same station | 20.8°C about the same | 4.6°C about the same | 1,230 mm |
| Le Relecq-Kerhuon 15 km | same station | 20.8°C about the same | 4.6°C about the same | 1,230 mm |
| Pont-de-Buis-lès-Quimerch 15 km | Saint-Ségal S A | 22.5°C 1.7°C warmer | 3.9°C 0.7°C colder | 1,126 mm |
Irvillac weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Brest-Guipavas station.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.7°C | 4.6°C | 7.1°C | 143 mm | 61 |
| February | 10.0°C | 4.3°C | 7.1°C | 119 mm | 82 |
| March | 11.9°C | 5.4°C | 8.6°C | 82 mm | 122 |
| April | 13.9°C | 6.3°C | 10.1°C | 92 mm | 165 |
| May | 16.8°C | 8.9°C | 12.8°C | 75 mm | 188 |
| June | 19.1°C | 11.4°C | 15.3°C | 65 mm | 184 |
| July | 20.8°C | 13.1°C | 17.0°C | 71 mm | 180 |
| August | 20.9°C | 13.2°C | 17.1°C | 75 mm | 172 |
| September | 19.3°C | 11.5°C | 15.4°C | 79 mm | 158 |
| October | 16.0°C | 9.6°C | 12.8°C | 129 mm | 109 |
| November | 12.5°C | 7.0°C | 9.8°C | 147 mm | 72 |
| December | 10.3°C | 5.0°C | 7.7°C | 155 mm | 61 |
| Year | 15.1°C | 8.4°C | 11.7°C | 1,230 mm | 1,555 |
Where Irvillac’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Brest-Guipavas, 16 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, Brest-Guipavas, 16 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 Irvillac’s climate
How warm does Irvillac get in summer?
August is the warmest month, with average highs of 20.9°C. About 11 days a year reach 25°C, fewer than 98% of mainland French towns, and about under 1 reach 30°C.
How cold does Irvillac get in winter?
February nights average 4.3°C. The air drops to 0°C or below on about 14 nights a year, and about under 1 days a year stay below freezing all day.
How much rain does Irvillac get?
About 1,230 mm a year, more than 97% of mainland French towns. December is the wettest month (155 mm) and June the driest (65 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Brest-Guipavas (16 km away), averages 1,555 hours of sunshine a year.
Are these figures for Irvillac itself?
No: they are the normals of the Météo-France station matched to Irvillac, Brest-Guipavas, 16 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 BREST-GUIPAVAS, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Irvillac →
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.