Weather in Biarritz in September 2025
Average weather
Average temperature in Biarritz in September
Going from a maximum of +33°C during the day to a minimum of +12°C during the night, the temperature in September averages around +26°C.
The average maximum temperature goes up 24% by the end of the month, compared with the beginning of the month, from +25°C to +30°C.
Is Biarritz warm or cold in September?
Biarritz is typically warm in September.
Maximum temperatures go down compared to the previous month from +25°C to +23°C. The minimum temperature also goes down from +17°C to +15°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in Biarritz, here is the comparison with other months:
Water temperature in Biarritz in September
Water in Biarritz in September is Fresh. It varies from +19°C to +23°C, with an average of +21°C. This is almost similar to the air temperature, which averages +23°C.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Biarritz in September?
Climate in Biarritz in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +25°C | +23°C | +20°C | ||||
| Min. temperature | ||||||
| +10°C | +6°C | +1°C | ||||
| Max. temperature | ||||||
| +40°C | +37°C | +33°C | ||||
| Rainfall | ||||||
| 93 mm | 93 mm | 119 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +21°C | +21°C | +19°C | ||||
| Humidity | ||||||
| 78% | 77% | 76% | ||||
| Air pressure | ||||||
| 1017 HPa | 1017 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 5 | 7 | 7 | ||||
| Cloudy days | ||||||
| 8 | 6 | 7 | ||||
| Rainy days | ||||||
| 15 | 14 | 16 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +25°C in the day, the average maximum temperature lowers to +23°C. The rainfall amount in September stays the same as in the previous month with a 93 mm of total precipitation. It feels drier, as humidity decreases from 78% to 77%. The average wind speed doesn’t change much during September, staying around 2 m/s. The good news is there are likely to be more sunny days in September, from 5 to 7.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Biarritz is gradually increasing during September, going from 2 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Biarritz?
Climate Change over Years
The climate in Biarritz in September has not changed much over the last 43 years.
The average temperature was the lowest in 1980 (+17°C) and the highest in 2022 (+20°C). The driest year was 1991 with only 917 mm of rainfall, and the wettest year was 2013 with 1763 mm.
FAQ
Is September a good time to visit Biarritz?
Can you sunbathe in Biarritz in September?
Can you swim in Biarritz in September?
Is Biarritz rainy in September?
Is it sunny in Biarritz in September?
Other cities in France
Monthly weather in Biarritz
Source of the data
For this page, we’ve looked at the typical weather in Biarritz, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.