Weather in Biarritz for September 2025
Yellow High Temperature Warning - See hour by hour.
Until now, September 2025 in Biarritz has been nearly identical to the historical average, with a temperature of 22.1 °C (showing only a slight deviation of -0.4 °C).
Expect cooler weather in the next days in Biarritz with the forecast suggesting a temperature of 20.4 °C, lower than the historical average.
In general, the average temperature in Biarritz at the beginning of September is 23.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.7 °C by the end of September.
Biarritz in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 156.1 mm.
Is September a good time to visit Biarritz? check out the best time to travel to Biarritz page.
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Biarritz Weather September
Temperatures trend during September in Biarritz
September weather in Biarritz day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy light rain with thunder | 21° /16° | 13.8 mm | 5 | |
| 2 Sept. |  Moderate or heavy rain shower | 22° /16° | 19.8 mm | 5 | |
| 3 Sept. |  Partly cloudy | 25° /16° | 2.8 mm | 6 | |
| 4 Sept. |  Light rain shower | 24° /17° | 2.5 mm | 6 | |
| 5 Sept. |  Sunny | 24° /15° | 2.4 mm | 6 | |
| 6 Sept. | Sunny | 25° /16° | 11.3 mm | 6 | |
| 7 Sept. | Patchy rain possible | 25° /17° | 1.2 mm | 6 | |
| 8 Sept. | Patchy rain possible | 23° /16° | 2.8 mm | 5 | |
| 9 Sept. | Patchy rain possible | 23° /16° | 2 mm | 5 | |
| 10 Sept. | Patchy rain possible | 22° /16° | 3 mm | 5 | |
| 11 Sept. | Light rain shower | 21° /16° | 11.2 mm | 5 | |
| 12 Sept. | Light rain shower | 19° /15° | 4.8 mm | 4 | |
| 13 Sept. | Patchy rain possible | 20° /14° | 0.4 mm | 5 | |
| 14 Sept. |  Cloudy | 22° /13° | 0 mm | 5 | |
| 15 Sept. |  Thundery outbreaks possible | 23° /13° | 0 mm | 6 | |
| 16 Sept. | Patchy rain possible | 22° /16° | 0.2 mm | 1.2 | |
| 17 Sept. | Sunny | 26° /15° | 0 mm | 1.4 | |
| 18 Sept. | Sunny | 32° /17° | 0 mm | 1.4 | |
| 19 Sept. | Patchy rain possible | 26° /20° | 1.7 mm | 1.2 | |
| 20 Sept. |  Moderate rain | 20° /17° | 6.1 mm | 0.2 | |
| 21 Sept. | Patchy rain possible | 16° /14° | 2 mm | 4 | |
| 22 Sept. | Patchy rain possible | 14° /11° | 4.9 mm | 3 | |
| 23 Sept. | Moderate rain | 15° /11° | 7.3 mm | 3 | |
| 24 Sept. | Patchy rain possible | 17° /13° | 1.3 mm | 3 | |
| 25 Sept. | Patchy rain possible | 17° /13° | 1.3 mm | 3 | |
| 26 Sept. | Sunny | 18° /9° | 0 mm | 4 | |
| 27 Sept. | Sunny | 21° /10° | 0 mm | 4 | |
| 28 Sept. | Sunny | 19° /12° | 0 mm | 5 | |
| 29 Sept. | Patchy rain possible | 23° /14° | 0.1 mm | 4 | |
| 30 Sept. | Sunny | 23° /15° | 0 mm | 6 | |
| Next | |||||
Biarritz weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 24°/17° | 22°/15° | 20°/14° |
| Rainfall | 135 mm | 156 mm | 135 mm |
| Wind | 16.9 km/h | 16.2 km/h | 18.6 km/h |
| Humidity | 77% | 76% | 74% |
| Rainy days | 18 days | 19 days | 17 days |
| Dry days | 13 days | 11 days | 14 days |
Planning a trip to Biarritz? Discover the best time to visit
Biarritz in September - FAQ
Biarritz water temperatures in September
The average water temperature of the Atlantic Ocean near Biarritz in September is 20.4 °C. Temperatures remain fairly consistent throughout the month.
- What is the water temperature in Biarritz in September?
- The average water temperature in Biarritz in September is 20.4 °C.
- Can you swim in Biarritz in September?
- Refreshing and invigorating. Expect to feel chilled after 10–20 minutes; a shorty wetsuit extends water time, especially at dawn.
What to pack to Biarritz in September?
As you prepare for your trip to Biarritz in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Biarritz, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Biarritz
UV exposure in Biarritz during September
Quick links
Where is Biarritz?Get accurate weather forecasts for Biarritz, located at latitude 43.481 and longitude -1.557. Stay updated with localized weather information tailored for Biarritz.