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Pyrénées-Atlantiques (Biarritz)
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Weather in Pyrénées-Atlantiques for September 2025

Your guide to Pyrénées-Atlantiques weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Yellow High Temperature Warning - See hour by hour.

    • Temperatures

  • Until now, September 2025 in Pyrénées-Atlantiques has been nearly identical to the historical average, with a temperature of 22.1 °C (showing only a slight deviation of -0.5 °C).

  • Expect cooler weather in the next days in Pyrénées-Atlantiques with the forecast suggesting a temperature of 19.6 °C, lower than the historical average.

  • In general, the average temperature in Pyrénées-Atlantiques at the beginning of September is 23.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16 °C by the end of September.

    • Rain 🌧️

  • Pyrénées-Atlantiques in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 156.1 mm.

    • More

  • Is September a good time to visit Pyrénées-Atlantiques? check out the best time to travel to Pyrénées-Atlantiques page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
11
Dry days
Average rainy days
19
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/15°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
76 %
Avg humidity

Pyrénées-Atlantiques Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy light rain with thunder
21°
2
Moderate or heavy rain shower
22°
3
Partly cloudy
25°
4
Light rain shower
24°
5
Sunny
24°
6
Sunny
25°
7
Patchy rain possible
25°
8
Patchy rain possible
23°
9
Patchy rain possible
23°
10
Patchy rain possible
22°
11
Light rain shower
21°
12
Light rain shower
19°
13
Patchy rain possible
20°
14
Cloudy
22°
15
Thundery outbreaks possible
22°
16
Sunny
22°
17
Weather Alert Sunny
25°
18
Weather Alert Sunny
31°
19
Patchy rain possible
29°
20
Moderate rain
27°
21
Moderate rain
17°
22
Patchy rain possible
17°
23
Moderate rain
17°
24
Sunny
17°
25
Sunny
19°
26
Sunny
16°
27
Sunny
17°
28
Patchy rain possible
13°
29
Moderate rain
15°
30
Patchy rain possible
15°

Temperatures trend during September in Pyrénées-Atlantiques

See the weather trend as well as the moving average line

September weather in Pyrénées-Atlantiques day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 21° /16° 13.8 mm 5
2 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 22° /16° 19.8 mm 5
3 Sept. Partly cloudy
Partly cloudy
 25° /16° 2.8 mm 6
4 Sept. Light rain shower
Light rain shower
 24° /17° 2.5 mm 6
5 Sept. Sunny
Sunny
 24° /15° 2.4 mm 6
6 Sept. Sunny
Sunny
 25° /16° 11.3 mm 6
7 Sept. Patchy rain possible
Patchy rain possible
 25° /17° 1.2 mm 6
8 Sept. Patchy rain possible
Patchy rain possible
 23° /16° 2.8 mm 5
9 Sept. Patchy rain possible
Patchy rain possible
 23° /16° 2 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
 22° /16° 3 mm 5
11 Sept. Light rain shower
Light rain shower
 21° /16° 11.2 mm 5
12 Sept. Light rain shower
Light rain shower
 19° /15° 4.8 mm 4
13 Sept. Patchy rain possible
Patchy rain possible
 20° /14° 0.4 mm 5
14 Sept. Cloudy
Cloudy
 22° /13° 0 mm 5
15 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 22° /14° 0.4 mm 5
16 Sept. Sunny
Sunny
 22° /14° 0 mm 6
17 Sept. Sunny
Sunny
 25° /15° 0 mm 1.4
18 Sept. Sunny
Sunny
 31° /16° 0 mm 1.4
19 Sept. Patchy rain possible
Patchy rain possible
 29° /20° 2.2 mm 1.2
20 Sept. Moderate rain
Moderate rain
 27° /17° 10.9 mm 0.7
21 Sept. Moderate rain
Moderate rain
 17° /15° 13.6 mm 0.1
22 Sept. Patchy rain possible
Patchy rain possible
 17° /13° 1.9 mm 4
23 Sept. Moderate rain
Moderate rain
 17° /13° 5.3 mm 3
24 Sept. Sunny
Sunny
 17° /11° 0 mm 4
25 Sept. Sunny
Sunny
 19° /9° 0 mm 4
26 Sept. Sunny
Sunny
 16° /9° 0 mm 4
27 Sept. Sunny
Sunny
 17° /8° 0.1 mm 4
28 Sept. Patchy rain possible
Patchy rain possible
 13° /10° 2.6 mm 3
29 Sept. Moderate rain
Moderate rain
 15° /9° 5.5 mm 3
30 Sept. Patchy rain possible
Patchy rain possible
 15° /13° 2.4 mm 3
Next
Important Notice
Our weather forecast for Pyrénées-Atlantiques in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Pyrénées-Atlantiques forecast closer to your planned date for the most up-to-date weather information.
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Pyrénées-Atlantiques weather in September vs August vs October

Compare September weather in Pyrénées-Atlantiques with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AugustSeptemberOctober
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures24°/17°22°/15°20°/14°
Rainfall135 mm156 mm135 mm
Wind16.9 km/h16.2 km/h18.6 km/h
Humidity77%76%74%
Rainy days18 days19 days17 days
Dry days13 days11 days14 days

Planning a trip to Pyrénées-Atlantiques? Discover the best time to visit

Pyrénées-Atlantiques in September - FAQ

What are the expected maximum and minimum temperatures in Pyrénées-Atlantiques during September?
During September, expect a variety of temperatures with highs around 22° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Pyrénées-Atlantiques during September?
Significant rainfall exceeding 156.1 mm is expected in Pyrénées-Atlantiques during September, occurring over more than 19 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Pyrénées-Atlantiques during September?
The average wind speed in Pyrénées-Atlantiques during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

Pyrénées-Atlantiques water temperatures in September

The average water temperature of the Atlantic Ocean near Pyrénées-Atlantiques in September is 20.4 °C. At the beginning of September temperatures are around 20.4 °C; by the end of the month they get a bit warmer and reach 21 °C.

What is the water temperature in Pyrénées-Atlantiques in September?
The average water temperature in Pyrénées-Atlantiques in September is 20.4 °C.
Can you swim in Pyrénées-Atlantiques 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 Pyrénées-Atlantiques in September?

As you prepare for your trip to Pyrénées-Atlantiques 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 Pyrénées-Atlantiques, 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 Pyrénées-Atlantiques

Explore the daily rainfall trends and prepare for Pyrénées-Atlantiquess September weather 💧

UV exposure in Pyrénées-Atlantiques during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Pyrénées-Atlantiques?

Get accurate weather forecasts for Pyrénées-Atlantiques, located at latitude 43.481 and longitude -1.557. Stay updated with localized weather information tailored for Pyrénées-Atlantiques.

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