Rainfall in Marnans tops that of 87% of mainland French towns: 1,004 mm a year
Midwinter brings lows of about 0.5°C. In January, nights here are colder than in 80% of mainland French towns. Of all months, October brings the most rain and February the least. Plan time outside from May to September, when highs sit at 20–27°C.
Figures from Météo-France’s Saint-Christophe-L station, 15 km south-west.
A year in Marnans at a glance
Each month’s typical high and low in °C, at the Saint-Christophe-L station.
What a year in Marnans feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Christophe-L.
About 1,004 mm of rain a year
October is the wettest month and February the driest. About 30 days a year bring 10 mm or more. 45th wettest of 110 towns of 2,500+ in Isère.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Grenoble-Saint-Geoirs
A frosty town: 51 frosts and 69 days of 25°C a year
On about 51 nights a year the air drops to 0°C or below, and on about 9 days it stays below freezing all day. About 69 days a year reach 25°C, and 20 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Christophe-L: 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-Christophe-L
Saint-Christophe-L is 15 km south-west of Marnans. Every figure on this page is the station’s, not a measurement in Marnans itself.
| Station (Météo-France number) | Saint-Christophe-L (26298001) |
| Distance from the town | 15 km south-west |
| Station altitude | 452 m |
| Town altitude (its center) | 560 m |
| Period | 1991–2020 |
| Nearest station of any kind | 9.8 km |
| Sunshine measured at | Grenoble-Saint-Geoirs, 9.8 km away |
Marnans sits 108 m higher than the station. Air usually cools by about 0.65°C every 100 m, so expect Marnans to run about 0.7°C cooler than these figures.
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 Marnans 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 |
|---|---|---|---|---|
| Marnans | Saint-Christophe-L | 26.9°C | 0.5°C | 1,004 mm |
| Saint-Siméon-de-Bressieux 4.5 km | Grenoble-Saint-Geoirs | 27.1°C about the same | −0.7°C 1.2°C colder | 915 mm |
| Saint-Étienne-de-Saint-Geoirs 9.5 km | Grenoble-Saint-Geoirs | 27.1°C about the same | −0.7°C 1.2°C colder | 915 mm |
| La Côte-Saint-André 11 km | Grenoble-Saint-Geoirs | 27.1°C about the same | −0.7°C 1.2°C colder | 915 mm |
| Vinay 16 km | Chatte | 28.3°C 1.4°C warmer | −0.5°C 1°C colder | 968 mm |
| Beaurepaire 16 km | Saint-Sorlin-en-Va | 28.6°C 1.7°C warmer | 1.2°C 0.7°C milder | 855 mm |
| Saint-Marcellin 17 km | Chatte | 28.3°C 1.4°C warmer | −0.5°C 1°C colder | 968 mm |
Marnans weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Christophe-L station; sunshine at Grenoble-Saint-Geoirs.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.2°C | 0.5°C | 3.4°C | 69 mm | 91 |
| February | 7.7°C | 0.6°C | 4.2°C | 54 mm | 112 |
| March | 12.5°C | 3.4°C | 7.9°C | 66 mm | 173 |
| April | 16.1°C | 5.9°C | 11.0°C | 85 mm | 190 |
| May | 20.2°C | 9.6°C | 14.9°C | 97 mm | 221 |
| June | 24.3°C | 13.2°C | 18.7°C | 70 mm | 258 |
| July | 26.9°C | 15.4°C | 21.2°C | 68 mm | 292 |
| August | 26.8°C | 15.4°C | 21.1°C | 76 mm | 263 |
| September | 21.9°C | 11.9°C | 16.9°C | 112 mm | 199 |
| October | 16.6°C | 8.7°C | 12.6°C | 124 mm | 140 |
| November | 10.3°C | 4.1°C | 7.2°C | 116 mm | 91 |
| December | 6.8°C | 1.3°C | 4.0°C | 66 mm | 78 |
| Year | 16.4°C | 7.5°C | 11.9°C | 1,004 mm | 2,108 |
Where Marnans’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Christophe-L, 15 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, Grenoble-Saint-Geoirs, 9.8 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 Marnans’s climate
How warm does Marnans get in summer?
July is the warmest month, with average highs of 26.9°C. About 69 days a year reach 25°C, more than 62% of mainland French towns, and about 20 reach 30°C.
How cold does Marnans get in winter?
January nights average 0.5°C. The air drops to 0°C or below on about 51 nights a year, and about 9 days a year stay below freezing all day.
How much rain does Marnans get?
About 1,004 mm a year, more than 87% of mainland French towns. October is the wettest month (124 mm) and February the driest (54 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Grenoble-Saint-Geoirs (9.8 km away), averages 2,108 hours of sunshine a year.
Are these figures for Marnans itself?
No: they are the normals of the Météo-France station matched to Marnans, Saint-Christophe-L, 15 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-CHRISTOPHE-L_SAPC, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Marnans →
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.