Biarritz weather in September
September in Biarritz: nice, rainy, with clean air — an excellent time to visit.
#3 of 12 months in Biarritz · #435 of 897 destinations to visit in September · comfort 83/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Biarritz in September
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Biarritz climate normals — September
| Daytime high | 23°C / 74°F | 😎 nice |
|---|---|---|
| Nighttime low | 17°C / 62°F | |
| Rainfall | 96 mm / 3.8 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 16°C / 61°F | |
| Sunshine | 10 h/day | |
| Daylight | 12.5 h | |
| Wind | 17 km/h / 11 mph | |
| Air quality (US AQI) | 43 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Biarritz in September — FAQ
- Is September a good time to visit Biarritz?
- September in Biarritz: nice, rainy, with clean air — an excellent time to visit. It ranks #3 of 12 months for Biarritz on SeasonMap's comfort score (83/100).
- What is the weather like in Biarritz in September?
- In September, Biarritz averages a daily high of 23.3°C and a low of 16.9°C, with about 95.6 mm of rain over roughly 11 rainy days.
- What is the air quality in Biarritz in September?
- Biarritz has a mean US Air Quality Index of about 43 in September.