Donostia / San Sebastián
September
Weather in Donostia / San Sebastián for September 2025
Your guide to Donostia / San Sebastián weather in September - trends and predictions
In general, the average temperature in Donostia / San Sebastián at the beginning of September is 23.4 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 22.6 °C by the end of September.
The climate of Donostia / San Sebastián in September is notably wet, with an average of 13 rainy days.
Is September a good time to visit Donostia / San Sebastián? check out the best time to travel to Donostia / San Sebastián page.
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17
Dry days
13
Rainy days
0
Snow days
25°/16°
Temperatures
13 km/h
Avg max wind
74 %
Avg humidity
Donostia / San Sebastián in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  23° | 2  21° | 3  22° | 4  25° | 5 24° | 6  23° | 7 26° |
| 8  25° | 9  25° | 10 23° | 11 22° | 12 20° | 13 19° | 14 21° |
| 15 22° | 16 23° | 17  23° | 18 23° | 19 23° | 20 24° | 21 23° |
| 22 19° | 23 20° | 24 24° | 25 24° | 26 22° | 27  21° | 28 21° |
| 29 22° | 30 24° |
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Temperatures trend during September in Donostia / San Sebastián
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Patchy light rain with thunder | 23° /16° | 7.5 mm | 5 | |
| 2 Sept. | Moderate or heavy rain shower | 21° /17° | 30.3 mm | 5 | |
| 3 Sept. | Cloudy | 22° /16° | 4.5 mm | 5 | |
| 4 Sept. | Partly cloudy | 25° /17° | 5.2 mm | 6 | |
| 5 Sept. | Partly cloudy | 24° /17° | 3.7 mm | 6 | |
| 6 Sept. | Sunny | 23° /16° | 18.3 mm | 6 | |
| 7 Sept. | Partly cloudy | 26° /16° | 1.6 mm | 7 | |
| 8 Sept. | Patchy rain possible | 25° /15° | 0.5 mm | 6 | |
| 9 Sept. | Thundery outbreaks possible | 25° /15° | 2.7 mm | 6 | |
| 10 Sept. | Patchy rain possible | 23° /16° | 3.7 mm | 5 | |
| 11 Sept. | Moderate or heavy rain shower | 22° /15° | 28.7 mm | 5 | |
| 12 Sept. | Cloudy | 20° /14° | 15.9 mm | 5 | |
| 13 Sept. | Cloudy | 19° /14° | 2.1 mm | 5 | |
| 14 Sept. | Cloudy | 21° /12° | 0 mm | 5 | |
| 15 Sept. | Sunny | 22° /13° | 0 mm | 6 | |
| 16 Sept. | Partly cloudy | 23° /14° | 0 mm | 6 | |
| 17 Sept. | Patchy light drizzle | 23° /14° | 0.9 mm | 5 | |
| 18 Sept. | Light rain shower | 23° /14° | 0.6 mm | 6 | |
| 19 Sept. | Patchy rain possible | 23° /14° | 0.1 mm | 5 | |
| 20 Sept. | Sunny | 24° /15° | 1.3 mm | 6 | |
| 21 Sept. | Light rain shower | 23° /15° | 12.2 mm | 5 | |
| 22 Sept. | Light rain shower | 19° /13° | 9 mm | 4 | |
| 23 Sept. | Light rain shower | 20° /12° | 1.3 mm | 5 | |
| 24 Sept. | Sunny | 24° /12° | 0.1 mm | 6 | |
| 25 Sept. | Sunny | 24° /13° | 1.1 mm | 7 | |
| 26 Sept. | Patchy rain possible | 22° /14° | 5.6 mm | 5 | |
| 27 Sept. | Overcast | 21° /13° | 6.6 mm | 5 | |
| 28 Sept. | Sunny | 21° /12° | 7.3 mm | 6 | |
| 29 Sept. | Partly cloudy | 22° /12° | 0 mm | 6 | |
| 30 Sept. | Sunny | 24° /14° | 0 mm | 7 | |
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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.
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 25° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Donostia / San Sebastián during September?
Significant rainfall exceeding 168.4 mm is expected in Donostia / San Sebastián during September, occurring over more than 13 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 13 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
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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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