SeasonMapLa Rochelle weather in September
France
September in La Rochelle: nice, a little rain, with clean air — an excellent time to visit.
#3 of 12 months in La Rochelle · #377 of 1383 destinations to visit in September · comfort 87/100 (tier A)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on La Rochelle in September
Other months in La Rochelle
La Rochelle's forum calls early July generally sunny and warm, high 20s°C on a good day, with sunny weeks and rainy weeks both possible and hard to predict in advance. Regulars are consistent that this stretch of Atlantic coast sees sunny days clearly outnumber rainy ones in summer, but pack a raincoat for the occasional thunderstorm regardless.
Add your own note from La Rochelle's card on the map.
La Rochelle climate normals — September
| Daytime high | 22°C / 72°F | 😎 nice |
|---|---|---|
| Nighttime low | 16°C / 61°F | |
| Feels like (high) | 22°C / 72°F | |
| Sea temperature | 23°C / 73°F | 🙂 pleasant |
| Rainfall | 50 mm / 2 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 74% | 💧 humid |
| Dew point | 13°C / 55°F | |
| Sunshine | 10.1 h/day | |
| Daylight | 12.5 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in La Rochelle in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyGrand Pavois boat show, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for La Rochelle's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherLa Rochelle's weather peaks July–September, best around August.
September includes Grand Pavois boat show.
Best weatherFair weatherToughest weather
What's on in La Rochelle in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Atlantic swimming season
25 Jun – 20 Sep · usuallySea warm enoughThe bay only really warms up from the end of June and cools quickly after the first September gales. Locals swim either side of that in a wetsuit and think nothing of it.
- Season
Oyster and mussel season
1 Sep – 30 Apr · usuallyForaging seasonMarennes-Oleron oysters and the bouchot mussels of the bay run through the cold half of the year, and the market on the Place du Marche is where to eat them standing up.
- Festival
Grand Pavois boat show
22–27 SepMajor festivalCrowdedBook earlySix days at the Port des Minimes with several hundred boats afloat and tens of thousands of visitors, which is why late September here is not the cheap shoulder it looks like. Source ↗
Nearby, and something's on
Within 300 km of La Rochelle — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is La Rochelle?
La Rochelle in September — FAQ
- Is September a good time to visit La Rochelle?
- September in La Rochelle: nice, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for La Rochelle on SeasonMap's comfort score (87/100).
- What is the weather like in La Rochelle in September?
- In September, La Rochelle averages a daily high of 22.3°C and a low of 16°C, with about 50.4 mm of rain over roughly 8.4 rainy days.
- What is the air quality in La Rochelle in September?
- La Rochelle has a mean US Air Quality Index of about 37 in September.
Other months in La Rochelle
Compare La Rochelle in September
Warmer or cooler than La Rochelle in September
Similar destinations in Western Europe — September
Within 300 km: Nantes' Le Voyage a Nantes on 4 Jul – 6 Sep, and Bordeaux's Oyster season on the Bassin around 1 Sep – 30 Apr.