Bayonne 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
Fair
Best time to visit: July – August
What is the weather like in Bayonne in September?
In September, Bayonne is warm: daytime highs average 22 °C, and nights cool down to about 16 °C. The sea averages 21.0 °C – refreshing for a swim. The sun shines for around 7 hours a day. Rain is frequent, with about 11 rainy days and 85 mm in total. All in all, September is a so-so month for a holiday in Bayonne.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 70 | 55 | 24 |
| Day | 24° | 22° | 20° |
| Night | 18° | 16° | 14° |
| Sea | 22° | 21° | 19° |
| Sun | 7 h | 7 h | 5 h |
| Rain days | 11 | 11 | 12 |
More details for September
- Daylight
- 12 h 35 min07:44 – 20:19
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 4 daysdew point 18 °C or moreAll months
- Wind
- 17 km/haverage daily peakAll months
- Cloud cover
- 55 %on averageAll months
- Hot days
- 1 day30 °C or moreAll months
- Time zone
- UTC+2Europe/Paris
How the score comes together
- Temperatureweight 35 %55 %
- Seaweight 25 %57 %
- Sunshineweight 20 %60 %
- Few rainy daysweight 20 %49 %
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
Bayonne in September: quick answers
Is Bayonne hot in September?
Warm rather than hot: in September, daytime highs in Bayonne average 22 °C and nights cool to about 16 °C. On about 1 days the thermometer climbs to 30 °C or more.
Can you swim in Bayonne in September?
Yes. In September the sea averages 21.0 °C – refreshing for a swim.
Does it rain much in Bayonne in September?
Rain is frequent, with about 11 rainy days and 85 mm in total.
Bayonne month by month
The whole year in BayonneAll 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