Summers in Saint-Didier are cooler than in 91% of mainland French towns
On a normal January night the air cools to about 3.2°C. It is a wet place: more rain falls here than on 82% of mainland French towns. December is the wettest month, June the driest. An umbrella earns its place on about 140 days a year with 1 mm of rain or more.
These are the figures of Météo-France’s Fougères station, 29 km north-east; at that distance they describe the area more than the town.
A year in Saint-Didier at a glance
Each month’s typical high and low in °C, at the Fougères station.
What a year in Saint-Didier feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Fougères.
About 939 mm of rain a year
December is the wettest month and June the driest. About 28 days a year bring 10 mm or more. 4th wettest of 99 towns of 2,500+ in Ille-et-Vilaine.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Rennes-Saint-Jacques
28 frosts and 31 days of 25°C a year
On about 28 nights a year the air drops to 0°C or below, and on about 2 days it stays below freezing all day. About 31 days a year reach 25°C, and 5 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Fougères: 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 Fougères
Fougères is 29 km north-east of Saint-Didier. Every figure on this page is the station’s, not a measurement in Saint-Didier itself.
| Station (Météo-France number) | Fougères (35115001) |
| Distance from the town | 29 km north-east |
| Station altitude | 74 m |
| Town altitude (its center) | 74 m |
| Period | 1991–2014 (the station’s own record) |
| Nearest station of any kind | 19 km |
| Sunshine measured at | Rennes-Saint-Jacques, 27 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-Didier 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 Ille-et-Vilaine.
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-Didier | Fougères | 23.3°C | 3.2°C | 939 mm |
| Châteaubourg 2.7 km | Rennes-Saint-Jacques | 24.8°C 1.5°C warmer | 3.3°C about the same | 691 mm |
| Servon-sur-Vilaine 7.2 km | Rennes-Saint-Jacques | 24.8°C 1.5°C warmer | 3.3°C about the same | 691 mm |
| Piré-Chancé 10 km | Rennes-Saint-Jacques | 24.8°C 1.5°C warmer | 3.3°C about the same | 691 mm |
| Val-d'Izé 10 km | same station | 23.3°C about the same | 3.2°C about the same | 939 mm |
| Châteaugiron 11 km | Rennes-Saint-Jacques | 24.8°C 1.5°C warmer | 3.3°C about the same | 691 mm |
| La Bouëxière 11 km | same station | 23.3°C about the same | 3.2°C about the same | 939 mm |
Saint-Didier weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Fougères station; sunshine at Rennes-Saint-Jacques.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.1°C | 3.2°C | 5.7°C | 96 mm | 68 |
| February | 9.1°C | 3.0°C | 6.1°C | 76 mm | 93 |
| March | 12.3°C | 4.7°C | 8.5°C | 68 mm | 134 |
| April | 14.9°C | 6.4°C | 10.6°C | 65 mm | 174 |
| May | 18.3°C | 9.7°C | 14.0°C | 71 mm | 202 |
| June | 21.3°C | 12.4°C | 16.9°C | 60 mm | 213 |
| July | 23.3°C | 13.8°C | 18.6°C | 64 mm | 220 |
| August | 23.4°C | 13.9°C | 18.6°C | 62 mm | 207 |
| September | 20.6°C | 11.7°C | 16.2°C | 69 mm | 181 |
| October | 16.3°C | 9.4°C | 12.9°C | 93 mm | 117 |
| November | 11.4°C | 5.8°C | 8.6°C | 104 mm | 84 |
| December | 8.3°C | 3.2°C | 5.8°C | 111 mm | 69 |
| Year | 15.6°C | 8.1°C | 11.9°C | 939 mm | 1,762 |
Where Saint-Didier’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Fougères, 29 km away: statistics for 1991–2020 (the station’s own years, 1991–2014, where its record is shorter).
- 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, 27 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 Ille-et-Vilaine.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Saint-Didier’s climate
How warm does Saint-Didier get in summer?
August is the warmest month, with average highs of 23.4°C. About 31 days a year reach 25°C, fewer than 91% of mainland French towns, and about 5 reach 30°C.
How cold does Saint-Didier get in winter?
February nights average 3.0°C. The air drops to 0°C or below on about 28 nights a year, and about 2 days a year stay below freezing all day.
How much rain does Saint-Didier get?
About 939 mm a year, more than 82% of mainland French towns. December is the wettest month (111 mm) and June the driest (60 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Rennes-Saint-Jacques (27 km away), averages 1,762 hours of sunshine a year.
Are these figures for Saint-Didier itself?
No: they are the normals of the Météo-France station matched to Saint-Didier, Fougères, 29 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 FOUGERES, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Saint-Didier →
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.