Monthly climate guide
Biarritz weather in September
September in Biarritz is typically warm, with average daytime highs around 25°C (77°F) and night-time lows near 15°C (59°F). The month usually brings about 63 mm of rain (some rain) and is often cloudy. Daytime highs are 2°C cooler than August and 4°C warmer than October.
What stands out in September
- It cools down fast from here: October is about 4°C cooler.
- September brings early autumn to Biarritz.
- Just 130 km apart, but Biarritz runs about 4°C warmer than Lourdes this month.
- Only 2 months are warmer in Biarritz than September.
Avg high
25°C
77°F
Avg low
15°C
59°F
Rainfall
63 mm
some rain
Humidity
71%
relative
Sky
63%
cloud · often cloudy
Biarritz weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 10°C / 51°F | 5°C / 40°F | 141 mm | 87% | 78% |
| February | 11°C / 52°F | 4°C / 40°F | 111 mm | 84% | 71% |
| March | 14°C / 57°F | 6°C / 43°F | 97 mm | 82% | 70% |
| April | 17°C / 62°F | 9°C / 47°F | 98 mm | 80% | 71% |
| May | 19°C / 67°F | 11°C / 52°F | 99 mm | 80% | 72% |
| June | 23°C / 73°F | 14°C / 58°F | 92 mm | 79% | 69% |
| July | 26°C / 79°F | 17°C / 62°F | 64 mm | 76% | 65% |
| August | 27°C / 81°F | 17°C / 62°F | 49 mm | 71% | 65% |
| September | 25°C / 77°F | 15°C / 59°F | 63 mm | 71% | 63% |
| October | 21°C / 69°F | 12°C / 54°F | 88 mm | 76% | 68% |
| November | 15°C / 58°F | 8°C / 47°F | 151 mm | 84% | 76% |
| December | 12°C / 54°F | 6°C / 43°F | 121 mm | 86% | 75% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A small travel umbrella, just in case
Is September a good time to visit Biarritz?
Compare the months in the chart above to find your ideal window.
Best time to visit Biarritz →Other France cities in September
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Biarritz weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/france/biarritz/september
<a href="https://weathercompare.eu/weather/france/biarritz/september">Biarritz weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/france/biarritz" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Biarritz weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/france/biarritz/september">Biarritz weather in September</a> – WeatherCompare</p>
Biarritz in September: quick answers
Is September a good time to visit Biarritz?
Yes. September is one of the best months for Biarritz, with highs around 25°C and about 63 mm of rain.
How warm is Biarritz in September?
Average highs are about 25°C (77°F) and average lows about 15°C (59°F), based on 10 years of daily data.
Does it rain a lot in Biarritz in September?
Biarritz typically gets around 63 mm of rain in September — some rain.
Figures are long-term averages for the area around Biarritz (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.