July in Assieu runs hotter than in 86% of mainland French towns
On a normal January night the air cools to about 1.5°C. Only 27°C separates winter nights from summer afternoons. None of its 6 nearest neighbors gets less rain. Expect about 37 frosty starts a year, nights when the air falls below freezing.
Figures from Météo-France’s Saint-Désirat Sa station, 17 km south.
A year in Assieu at a glance
Each month’s typical high and low in °C, at the Saint-Désirat Sa station.
What a year in Assieu feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Désirat Sa.
About 698 mm of rain a year
October is the wettest month and February the driest. About 22 days a year bring 10 mm or more. 111th wettest of 110 towns of 2,500+ in Isère.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Grenoble-Saint-Geoirs
37 frosts and 90 days of 25°C a year
On about 37 nights a year the air drops to 0°C or below, and on about 4 days it stays below freezing all day. About 90 days a year reach 25°C, and 34 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Désirat Sa: 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 Saint-Désirat Sa
Saint-Désirat Sa is 17 km south of Assieu. Every figure on this page is the station’s, not a measurement in Assieu itself.
| Station (Météo-France number) | Saint-Désirat Sa (07228001) |
| Distance from the town | 17 km south |
| Station altitude | 275 m |
| Town altitude (its center) | 269 m |
| Period | 1994–2020 (the station’s own record) |
| Nearest station of any kind | 9.2 km |
| Sunshine measured at | Grenoble-Saint-Geoirs, 35 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 Assieu 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 Isère.
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 |
|---|---|---|---|---|
| Assieu | Saint-Désirat Sa | 28.6°C | 1.5°C | 698 mm |
| Roussillon 5.8 km | Sablons | 30.2°C 1.6°C warmer | 0.7°C 0.8°C colder | 805 mm |
| Le Péage-de-Roussillon 6.6 km | Sablons | 30.2°C 1.6°C warmer | 0.7°C 0.8°C colder | 805 mm |
| Saint-Maurice-l'Exil 6.9 km | Sablons | 30.2°C 1.6°C warmer | 0.7°C 0.8°C colder | 805 mm |
| Salaise-sur-Sanne 7.7 km | Sablons | 30.2°C 1.6°C warmer | 0.7°C 0.8°C colder | 805 mm |
| Saint-Clair-du-Rhône 8.1 km | Sablons | 30.2°C 1.6°C warmer | 0.7°C 0.8°C colder | 805 mm |
| Condrieu 10 km | Sablons | 30.2°C 1.6°C warmer | 0.7°C 0.8°C colder | 805 mm |
Assieu weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Désirat Sa station; sunshine at Grenoble-Saint-Geoirs.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.7°C | 1.5°C | 4.6°C | 45 mm | 91 |
| February | 9.6°C | 1.9°C | 5.7°C | 30 mm | 112 |
| March | 14.2°C | 4.5°C | 9.4°C | 36 mm | 173 |
| April | 17.9°C | 7.5°C | 12.7°C | 54 mm | 190 |
| May | 21.8°C | 11.1°C | 16.5°C | 70 mm | 221 |
| June | 26.1°C | 14.6°C | 20.3°C | 56 mm | 258 |
| July | 28.6°C | 16.5°C | 22.5°C | 57 mm | 292 |
| August | 28.3°C | 16.1°C | 22.2°C | 49 mm | 263 |
| September | 23.6°C | 12.6°C | 18.1°C | 66 mm | 199 |
| October | 18.5°C | 9.7°C | 14.1°C | 94 mm | 140 |
| November | 11.9°C | 5.1°C | 8.5°C | 94 mm | 91 |
| December | 8.2°C | 2.2°C | 5.2°C | 47 mm | 78 |
| Year | 18.0°C | 8.6°C | 13.3°C | 698 mm | 2,108 |
Where Assieu’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Désirat Sa, 17 km away: statistics for 1991–2020 (the station’s own years, 1994–2020, 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, Grenoble-Saint-Geoirs, 35 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 Isère.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Assieu’s climate
How warm does Assieu get in summer?
July is the warmest month, with average highs of 28.6°C. About 90 days a year reach 25°C, more than 82% of mainland French towns, and about 34 reach 30°C.
How cold does Assieu get in winter?
January nights average 1.5°C. The air drops to 0°C or below on about 37 nights a year, and about 4 days a year stay below freezing all day.
How much rain does Assieu get?
About 698 mm a year, less than 67% of mainland French towns. October is the wettest month (94 mm) and February the driest (30 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Grenoble-Saint-Geoirs (35 km away), averages 2,108 hours of sunshine a year.
Are these figures for Assieu itself?
No: they are the normals of the Météo-France station matched to Assieu, Saint-Désirat Sa, 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 ST-DESIRAT SA, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Assieu →
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.