Arcachon weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: July – August
What is the weather like in Arcachon in September?
In September, Arcachon is warm: daytime highs average 24 °C, and nights cool down to about 16 °C. The sea averages 20.4 °C – refreshing for a swim. The sun shines for around 7 hours a day. Rain falls on about 9 days, adding up to 59 mm. All in all, September is a good month for a holiday in Arcachon.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 83 | 66 | 25 |
| Day | 26° | 24° | 20° |
| Night | 18° | 16° | 13° |
| Sea | 22° | 20° | 18° |
| Sun | 8 h | 7 h | 5 h |
| Rain days | 8 | 9 | 11 |
More details for September
- Daylight
- 12 h 36 min07:42 – 20:18
- UV index
- 5 · moderateclear sky, noon (estimate)All months
- Muggy days
- 1 daydew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 48 %on averageAll months
- Hot days
- 3 days30 °C or moreAll months
- Time zone
- UTC+2Europe/Paris
How the score comes together
- Temperatureweight 35 %78 %
- Seaweight 25 %49 %
- Sunshineweight 20 %68 %
- Few rainy daysweight 20 %65 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Arcachon in September: quick answers
Is Arcachon hot in September?
Warm rather than hot: in September, daytime highs in Arcachon average 24 °C and nights cool to about 16 °C. On about 3 days the thermometer climbs to 30 °C or more.
Can you swim in Arcachon in September?
Yes. In September the sea averages 20.4 °C – refreshing for a swim.
Does it rain much in Arcachon in September?
Rain falls on about 9 days, adding up to 59 mm.
Arcachon month by month
The whole year in ArcachonAll destinations: FranceWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences