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Weather in Donostia / San Sebastián for September 2025

Your guide to Donostia / San Sebastián weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Donostia / San Sebastián is slightly cooler than the historical average by -0.6 °C.

  • Expect cooler weather in the next days in Donostia / San Sebastián with the forecast suggesting a temperature of 21.9 °C, lower than the historical average.

  • In general, the average temperature in Donostia / San Sebastián at the beginning of September is 24.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 21 °C by the end of September.

    • Rain 🌧️

  • Donostia / San Sebastián experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 171 mm.

    • More

  • Is September a good time to visit Donostia / San Sebastián? check out the best time to travel to Donostia / San Sebastián page.

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

Average dry days
9
Dry days
Average rainy days
21
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/15°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
76 %
Avg humidity

Donostia / San Sebastián 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
22°
2
Moderate or heavy rain shower
23°
3
Cloudy
25°
4
Light rain shower
24°
5
Partly cloudy
24°
6
Sunny
26°
7
Partly cloudy
26°
8
Patchy rain possible
23°
9
Light rain shower
23°
10
Patchy rain possible
22°
11
Moderate or heavy rain shower
23°
12
Cloudy
20°
13
Light rain shower
19°
14
Cloudy
22°
15
Patchy rain possible
21°
16
Patchy rain possible
22°
17
Sunny
27°
18
Sunny
31°
19
Sunny
31°
20
Patchy rain possible
26°
21
Patchy rain possible
17°
22
Patchy rain possible
13°
23
Patchy rain possible
17°
24
Sunny
20°
25
Partly cloudy
19°
26
Patchy rain possible
19°
27
Partly cloudy
20°
28
Patchy rain possible
23°
29
Partly cloudy
22°
30
Sunny
24°

Temperatures trend during September in Donostia / San Sebastián

See the weather trend as well as the moving average line

September weather in Donostia / San Sebastián 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
 22° /15° 7 mm 5
2 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 23° /16° 20.3 mm 5
3 Sept. Cloudy
Cloudy
 25° /16° 3.2 mm 5
4 Sept. Light rain shower
Light rain shower
 24° /17° 3.9 mm 6
5 Sept. Partly cloudy
Partly cloudy
 24° /15° 2.5 mm 6
6 Sept. Sunny
Sunny
 26° /16° 12.2 mm 7
7 Sept. Partly cloudy
Partly cloudy
 26° /17° 1.2 mm 7
8 Sept. Patchy rain possible
Patchy rain possible
 23° /15° 4.9 mm 5
9 Sept. Light rain shower
Light rain shower
 23° /15° 2.9 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
 22° /15° 3.2 mm 5
11 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 23° /15° 19.6 mm 5
12 Sept. Cloudy
Cloudy
 20° /15° 11.6 mm 4
13 Sept. Light rain shower
Light rain shower
 19° /14° 1.7 mm 4
14 Sept. Cloudy
Cloudy
 22° /13° 0 mm 5
15 Sept. Patchy rain possible
Patchy rain possible
 21° /15° 2.2 mm 0.8
16 Sept. Patchy rain possible
Patchy rain possible
 22° /15° 0.4 mm 1.1
17 Sept. Sunny
Sunny
 27° /15° 0 mm 1.4
18 Sept. Sunny
Sunny
 31° /15° 0 mm 1.4
19 Sept. Sunny
Sunny
 31° /17° 0 mm 1.3
20 Sept. Patchy rain possible
Patchy rain possible
 26° /16° 4.1 mm 5
21 Sept. Patchy rain possible
Patchy rain possible
 17° /14° 1.8 mm 3
22 Sept. Patchy rain possible
Patchy rain possible
 13° /11° 2.4 mm 3
23 Sept. Patchy rain possible
Patchy rain possible
 17° /9° 0.8 mm 3
24 Sept. Sunny
Sunny
 20° /10° 0 mm 4
25 Sept. Partly cloudy
Partly cloudy
 19° /11° 0 mm 4
26 Sept. Patchy rain possible
Patchy rain possible
 19° /11° 0.2 mm 3
27 Sept. Partly cloudy
Partly cloudy
 20° /12° 0 mm 4
28 Sept. Patchy rain possible
Patchy rain possible
 23° /13° 2.8 mm 4
29 Sept. Partly cloudy
Partly cloudy
 22° /12° 0 mm 6
30 Sept. Sunny
Sunny
 24° /14° 0 mm 7
Next
Important Notice
Our weather forecast for Donostia / San Sebastián 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 Donostia / San Sebastián forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Donostia / San Sebastián weather in September vs August vs October

Compare September weather in Donostia / San Sebastián 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
Temperatures23°/16°22°/15°20°/13°
Rainfall136 mm171 mm131 mm
Wind13.7 km/h14.5 km/h17.7 km/h
Humidity79%76%74%
Rainy days19 days21 days20 days
Dry days12 days9 days11 days

Planning a trip to Donostia / San Sebastián? Discover the best time to visit

Donostia / San Sebastián in September - FAQ

What are the expected maximum and minimum temperatures in Donostia / San Sebastián 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 Donostia / San Sebastián during September?
Significant rainfall exceeding 171 mm is expected in Donostia / San Sebastián during September, occurring over more than 21 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Donostia / San Sebastián during September?
The average wind speed in Donostia / San Sebastián during September is 15 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Donostia / San Sebastián in September?

As you prepare for your trip to Donostia / San Sebastián 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 Donostia / San Sebastián, 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 Donostia / San Sebastián

Explore the daily rainfall trends and prepare for Donostia / San Sebastiáns September weather 💧

UV exposure in Donostia / San Sebastián during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Donostia / San Sebastián?

Get accurate weather forecasts for Donostia / San Sebastián, located at latitude 43.313 and longitude -1.975. Stay updated with localized weather information tailored for Donostia / San Sebastián.

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