Offshore Stays

Surf Biarritz in September

Surfing Biarritz in September: in the main surf season, air around 19°C, sea around 21°C, 2.2 mm of rain a day on average. Wetsuit: a 2mm shorty or springsuit.

Surf season

In season

Air temperature

19°C

Sea temperature

21°C

Rain

2.2 mm/day

Wind

11 km/h avg

Average wave height

1.1 m (4 ft)

Big days (top 10%)

1.8 m (6 ft)+

Swell period

11 s

Main swell direction

From NW (315°)

What to wear: with the sea around 21°C in September, expect a 2mm shorty or springsuit.

Surf size in Biarritz in September

Offshore of Biarritz, waves in September average 1.1 m (4 ft), below the year-round average of 1.3 m — the 7th biggest month of the year. One hour in ten is 1.8 m (6 ft) or bigger. The dominant swell runs at about 11 seconds from the NW.

These are open-ocean figures from 10 years of hourly wave data, not a beach forecast: a sheltered break will be smaller, an exposed reef or point can be bigger.

September in the context of Biarritz's surf season

Biarritz's main surf season runs April–May, September–November. September is inside it.

Full Biarritz surf and remote-work guide →

Frequently asked questions

Is September a good month to surf Biarritz?
Yes — September falls in Biarritz's main surf season (April–May, September–November).
How warm is the sea in Biarritz in September?
About 21°C on average, which calls for a 2mm shorty or springsuit.
What is the weather like in Biarritz in September?
Air temperature averages 19°C, with about 2.2 mm of rain per day and average winds of 11 km/h.
Climate: NASA POWER (MERRA-2) monthly climatology, 2001–2020. Sea temperature: NOAA Coral Reef Watch CoralTemp v3.1, 5 km monthly SST, 2015–2025 mean (nearest ocean cell). Surf season is Offshore Stays editorial. Waves: Open-Meteo Marine API, ECMWF ERA5-Ocean hourly reanalysis, 2016–2025 (offshore grid cell 43.5°N 1.5°W), retrieved 22 Oct 2026.