Sion is wetter than 88% of mainland French towns: 1,022 mm of rain a year
Météo-France’s Maumusson station, 17 km south-west: about 1,022 mm of rain falls in a typical year; July afternoons reach 27.4°C and January nights drop to 2.9°C. Warm days come often: about 90 a year reach 25°C, more than in 82% of mainland French towns. Frost is rarer than in 77% of mainland French towns: about 29 nights a year drop below freezing.
A year in Sion at a glance
Each month’s typical high and low in °C, at the Maumusson station.
What a year in Sion feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Maumusson.
About 1,022 mm of rain a year
November is the wettest month and July the driest. About 34 days a year bring 10 mm or more. The wettest of 11 towns of 2,500+ in Gers.
Rain by month
Millimeters
29 frosts and 90 days of 25°C a year
On about 29 nights a year the air drops to 0°C or below, and on about 1 days it stays below freezing all day. About 90 days a year reach 25°C, and 29 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Maumusson: 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 Maumusson
Maumusson is 17 km south-west of Sion. Every figure on this page is the station’s, not a measurement in Sion itself.
| Station (Météo-France number) | Maumusson (32245001) |
| Distance from the town | 17 km south-west |
| Station altitude | 164 m |
| Town altitude (its center) | 143 m |
| Period | 1991–2020 |
| Nearest station of any kind | 15 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 Sion 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 Gers.
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 |
|---|---|---|---|---|
| Sion | Maumusson | 27.4°C | 2.9°C | 1,022 mm |
| Eauze 15 km | Parleboscq | 27.4°C about the same | 2.1°C 0.8°C colder | 874 mm |
| Aire-sur-l'Adour 22 km | Grenade-sur-Ad | 28.1°C 0.7°C warmer | 2.3°C 0.6°C colder | 1,010 mm |
| Vic-Fezensac 24 km | Beaucaire | 28.2°C 0.8°C warmer | 2.3°C 0.6°C colder | 776 mm |
Sion weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Maumusson station.
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 10.6°C | 2.9°C | 6.7°C | 98 mm |
| February | 12.1°C | 3.0°C | 7.5°C | 76 mm |
| March | 15.7°C | 5.4°C | 10.6°C | 80 mm |
| April | 18.2°C | 7.6°C | 12.9°C | 97 mm |
| May | 21.8°C | 11.1°C | 16.5°C | 97 mm |
| June | 25.3°C | 14.3°C | 19.8°C | 80 mm |
| July | 27.4°C | 16.1°C | 21.8°C | 60 mm |
| August | 27.8°C | 16.1°C | 22.0°C | 65 mm |
| September | 24.7°C | 13.0°C | 18.9°C | 72 mm |
| October | 20.4°C | 10.1°C | 15.2°C | 82 mm |
| November | 14.2°C | 6.0°C | 10.1°C | 114 mm |
| December | 11.3°C | 3.6°C | 7.4°C | 100 mm |
| Year | 19.1°C | 9.1°C | 14.1°C | 1,022 mm |
Where Sion’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Maumusson, 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 Gers.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Sion’s climate
How warm does Sion get in summer?
August is the warmest month, with average highs of 27.8°C. About 90 days a year reach 25°C, more than 82% of mainland French towns, and about 29 reach 30°C.
How cold does Sion get in winter?
January nights average 2.9°C. The air drops to 0°C or below on about 29 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Sion get?
About 1,022 mm a year, more than 88% of mainland French towns. November is the wettest month (114 mm) and July the driest (60 mm).
Are these figures for Sion itself?
No: they are the normals of the Météo-France station matched to Sion, Maumusson, 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 MAUMUSSON, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Sion →
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.