Illiat has warmer summer afternoons than 81% of mainland French towns
The coldest hours of a January night bottom out at 1.3°C on average. Expect the heaviest rain in October and the lightest in February. Its yearly rainfall tops that of 75% of mainland French towns. Waterproofs come out on about 120 days a year, each with 1 mm of rain or more.
These are the figures of Météo-France’s Baneins station, 7.6 km south.
A year in Illiat at a glance
Each month’s typical high and low in °C, at the Baneins station.
What a year in Illiat feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Baneins.
About 880 mm of rain a year
October is the wettest month and February the driest. About 27 days a year bring 10 mm or more. 38th wettest of 60 towns of 2,500+ in Ain.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Mâcon
48 frosts and 89 days of 25°C a year
On about 48 nights a year the air drops to 0°C or below, and on about 7 days it stays below freezing all day. About 89 days a year reach 25°C, and 36 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Baneins: 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 Baneins
Baneins is 7.6 km south of Illiat. Every figure on this page is the station’s, not a measurement in Illiat itself.
| Station (Météo-France number) | Baneins (01028001) |
| Distance from the town | 7.6 km south |
| Station altitude | 242 m |
| Town altitude (its center) | 223 m |
| Period | 1991–2020 |
| Sunshine measured at | Mâcon, 14 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 Illiat 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 Ain.
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 |
|---|---|---|---|---|
| Illiat | Baneins | 28.2°C | 1.3°C | 880 mm |
| Saint-Didier-sur-Chalaronne 5.2 km | same station | 28.2°C about the same | 1.3°C about the same | 880 mm |
| Vonnas 9.1 km | same station | 28.2°C about the same | 1.3°C about the same | 880 mm |
| Châtillon-sur-Chalaronne 9.5 km | same station | 28.2°C about the same | 1.3°C about the same | 880 mm |
| La Chapelle-de-Guinchay 9.8 km | Mâcon | 27.1°C 1.1°C cooler | 0.7°C 0.6°C colder | 834 mm |
| Crêches-sur-Saône 9.9 km | Mâcon | 27.1°C 1.1°C cooler | 0.7°C 0.6°C colder | 834 mm |
| Replonges 13 km | Mâcon | 27.1°C 1.1°C cooler | 0.7°C 0.6°C colder | 834 mm |
Illiat weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Baneins station; sunshine at Mâcon.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.5°C | 1.3°C | 3.9°C | 60 mm | 62 |
| February | 8.5°C | 1.3°C | 4.9°C | 51 mm | 96 |
| March | 13.3°C | 4.1°C | 8.7°C | 53 mm | 164 |
| April | 17.3°C | 6.5°C | 11.9°C | 73 mm | 192 |
| May | 21.5°C | 10.7°C | 16.1°C | 80 mm | 217 |
| June | 25.7°C | 14.4°C | 20.0°C | 73 mm | 249 |
| July | 28.2°C | 15.8°C | 22.0°C | 79 mm | 275 |
| August | 28.1°C | 15.2°C | 21.6°C | 76 mm | 251 |
| September | 23.1°C | 11.6°C | 17.3°C | 78 mm | 195 |
| October | 17.4°C | 8.8°C | 13.1°C | 100 mm | 120 |
| November | 10.8°C | 4.7°C | 7.8°C | 95 mm | 71 |
| December | 7.2°C | 2.2°C | 4.7°C | 64 mm | 52 |
| Year | 17.3°C | 8.0°C | 12.7°C | 880 mm | 1,943 |
Where Illiat’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Baneins, 7.6 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, Mâcon, 14 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 Ain.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Illiat’s climate
How warm does Illiat get in summer?
July is the warmest month, with average highs of 28.2°C. About 89 days a year reach 25°C, more than 80% of mainland French towns, and about 36 reach 30°C.
How cold does Illiat get in winter?
January nights average 1.3°C. The air drops to 0°C or below on about 48 nights a year, and about 7 days a year stay below freezing all day.
How much rain does Illiat get?
About 880 mm a year, more than 75% of mainland French towns. October is the wettest month (100 mm) and February the driest (51 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Mâcon (14 km away), averages 1,943 hours of sunshine a year.
Are these figures for Illiat itself?
No: they are the normals of the Météo-France station matched to Illiat, Baneins, 7.6 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 BANEINS, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Illiat →
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.