The best months to visit Biarritz are May, June, September and October, when average highs sit comfortably between 19.3 °C and 23.2 °C and days are warm without the peak-summer squeeze. June brings highs around 22.7 °C with 13 rain days, while September holds at 23.2 °C — ideal for the Grande Plage. July and August are peak season, hot and sunniest but crowded with school-holiday visitors and higher prices. Winter is the quiet, low season, mild but damp, with December the least sunny month.
Best months MayJuneSeptemberOctober
Biarritz month by month
Average highs and lows (°C), 2016–2025. Highlighted bars are the best months.
| Month | High | Low | Rain days | Sunshine | Days ≥30 °C | Sea | Crowds |
|---|---|---|---|---|---|---|---|
| January | 11.6 °C | 4.9 °C | 15 | ●●●●● | – | 13 °C | ●●●●● |
| February | 13.8 °C | 5.9 °C | 12 | ●●●●● | – | 13 °C | ●●●●● |
| March | 15.1 °C | 7.3 °C | 16 | ●●●●● | – | 13 °C | ●●●●● |
| April | 17.1 °C | 9.2 °C | 14 | ●●●●● | – | 15 °C | ●●●●● |
| May | 19.3 °C | 12.1 °C | 15 | ●●●●● | 1 | 18 °C | ●●●●● |
| June | 22.7 °C | 15.7 °C | 13 | ●●●●● | 2 | 21 °C | ●●●●● |
| July | 24.1 °C | 17.5 °C | 10 | ●●●●● | 2 | 23 °C | ●●●●● |
| August | 25.1 °C | 17.7 °C | 10 | ●●●●● | 4 | 24 °C | ●●●●● |
| September | 23.2 °C | 15.4 °C | 13 | ●●●●● | 2 | 22 °C | ●●●●● |
| October | 20.6 °C | 12.8 °C | 13 | ●●●●● | – | 20 °C | ●●●●● |
| November | 15.5 °C | 8.6 °C | 16 | ●●●●● | – | 16 °C | ●●●●● |
| December | 13.3 °C | 6.8 °C | 14 | ●●●●● | – | 14 °C | ●●●●● |
How the months are picked.A month qualifies when its average high sits in the comfortable 20–28 °C band (scored down towards 9 °C and 37 °C), rain days are few and sunshine hours are high — at least 78 % of the city's best-scoring month. July and August are then set aside as peak season (school-holiday crowds and prices) whenever at least three other months qualify; where summer is the only comfortable window they stay. Figures are ten-year averages (2016-01-01 to 2025-12-31) from ERA5 reanalysis data via Open-Meteo (CC BY 4.0) for the city centre coordinates. Sunshine is shown relative to the city's own year (modelled data overstates absolute hours).Heat and sea: days with a high of 30 °C or more are averaged over 2016–2025 (ERA5); sea-surface temperature is the monthly mean 2022–2025 at the nearest open-sea grid point within about 20 km (Open-Meteo Marine).Crowds:Relative to an average month in the same region (Eurostat nights spent at tourist accommodation, by NUTS 2 region and month) — a measure of season, not of how crowded one city is compared with another. Busiest month August, quietest January; NUTS 2 region FRI1, 2022–2025, Eurostat.
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When to go, and what to expect
Spring (Mar–May)
Great for walkers and early beach-goers who want warmth without crowds.
Summer (Jun–Aug)
June is the sweet spot; July and August suit sun-seekers who don't mind crowds.
Autumn (Sep–Nov)
Arguably the best all-round window — warm sea, mild air, fewer people.
Winter (Dec–Feb)
For storm-watchers and off-season calm, not for beach days.
Notable events
- Summer (July)
- Biarritz Surf Festival
- September
- Le Temps d'Aimer la Danse (dance festival)
- Autumn (late September–October)
- Biarritz Latin America Film Festival (FIPADOC / Festival Biarritz Amérique Latine)
- July (14 July)
- Bastille Day celebrations
Frequently asked
Is Biarritz too hot in August?
No — August is the warmest month but comfortable, with average highs of 25.1 °C and lows of 17.7 °C. It's the sunniest stretch alongside July, though crowds and prices peak.
What is the rainiest month in Biarritz?
March and November are the wettest, each with 16 rain days. Rain is spread year-round; even summer sees 10 rain days in July and August.
Is winter worth visiting Biarritz?
It's the quiet low season — mild with highs of 11.6 °C in January and 13.8 °C in February, but damp and with December the least sunny month. Good for calm and coastal walks, not for the beach.
Know when to go? Now decide where to stay — our Biarritz area guide →
Areas of Biarritz
Best time to visit near here
Sources
- Open-Meteo historical weather API — monthly climate normals, 2016–2025 (CC BY 4.0)
- ERA5 reanalysis (ECMWF / Copernicus) — the underlying temperature, precipitation and sunshine data
- ReasonStay methodology — how the best months are computed and checked
An independent guide to Biarritz — honest, verified, no invented data. Climate figures: ERA5 via Open-Meteo, 2016–2025 averages; the best months are computed from them, not opinion.