Biarritz 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 Biarritz in September?
In September, Biarritz is warm: daytime highs average 23 °C, and nights cool down to about 15 °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 Biarritz.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 77 | 59 | 28 |
| Day | 24° | 23° | 20° |
| Night | 18° | 15° | 13° |
| Sea | 22° | 21° | 19° |
| Sun | 8 h | 7 h | 6 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)
- Muggy days
- 3 daysdew point 18 °C or more
- Wind
- 17 km/haverage daily peak
- Cloud cover
- 55 %on average
- Hot days
- 1 day30 °C or more
- Time zone
- UTC+2Europe/Paris
How the score comes together
- Temperatureweight 35 %60 %
- Seaweight 25 %57 %
- Sunshineweight 20 %72 %
- 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
Biarritz in September: quick answers
Is Biarritz hot in September?
Warm rather than hot: in September, daytime highs in Biarritz average 23 °C and nights cool to about 15 °C. On about 1 days the thermometer climbs to 30 °C or more.
Can you swim in Biarritz in September?
Yes. In September the sea averages 21.0 °C – refreshing for a swim.
Does it rain much in Biarritz in September?
Rain is frequent, with about 11 rainy days and 85 mm in total.
Biarritz month by month
The whole year in BiarritzAll destinations: France
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)