Donostia / San Sebastián
September
Weather in Donostia / San Sebastián for September 2026
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 24.3 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 21.4 °C by the end of September.
Donostia / San Sebastián experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 144.3 mm.
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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Temperatures
Rain 🌧️
More
9
Dry days
21
Rainy days
0
Snow days
22°/14°
Temperatures
14 km/h
Avg max wind
76 %
Avg humidity
Donostia / San Sebastián Weather September
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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 in Donostia / San Sebastián day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy light rain with thunder | 22° /15° | 7 mm | 5 | |
| 2 Sept. |  Moderate or heavy rain shower | 23° /16° | 20.3 mm | 5 | |
| 3 Sept. |  Cloudy | 25° /16° | 3.2 mm | 5 | |
| 4 Sept. |  Light rain shower | 24° /17° | 3.9 mm | 6 | |
| 5 Sept. |  Partly cloudy | 24° /15° | 2.5 mm | 6 | |
| 6 Sept. |  Sunny | 26° /16° | 12.2 mm | 7 | |
| 7 Sept. | Partly cloudy | 26° /17° | 1.2 mm | 7 | |
| 8 Sept. | Patchy rain possible | 23° /15° | 4.9 mm | 5 | |
| 9 Sept. | Light rain shower | 23° /15° | 2.9 mm | 5 | |
| 10 Sept. | Patchy rain possible | 22° /15° | 3.2 mm | 5 | |
| 11 Sept. | Moderate or heavy rain shower | 23° /15° | 19.6 mm | 5 | |
| 12 Sept. | Cloudy | 20° /15° | 11.6 mm | 4 | |
| 13 Sept. | Light rain shower | 19° /14° | 1.7 mm | 4 | |
| 14 Sept. | Cloudy | 22° /13° | 0 mm | 5 | |
| 15 Sept. | Sunny | 22° /14° | 0.8 mm | 6 | |
| 16 Sept. | Partly cloudy | 23° /14° | 0.2 mm | 6 | |
| 17 Sept. |  Patchy light drizzle | 24° /14° | 0.6 mm | 6 | |
| 18 Sept. | Light rain shower | 25° /14° | 0.4 mm | 7 | |
| 19 Sept. | Patchy rain possible | 26° /16° | 0.3 mm | 6 | |
| 20 Sept. | Sunny | 25° /15° | 4.6 mm | 6 | |
| 21 Sept. | Light rain shower | 21° /14° | 12.7 mm | 5 | |
| 22 Sept. | Light rain shower | 18° /12° | 11.3 mm | 4 | |
| 23 Sept. | Light rain shower | 18° /11° | 3 mm | 4 | |
| 24 Sept. | Sunny | 22° /12° | 2.3 mm | 5 | |
| 25 Sept. | Sunny | 22° /12° | 0.8 mm | 6 | |
| 26 Sept. | Patchy rain possible | 21° /13° | 3.8 mm | 5 | |
| 27 Sept. |  Overcast | 21° /12° | 4.4 mm | 5 | |
| 28 Sept. | Sunny | 21° /13° | 4.9 mm | 6 | |
| 29 Sept. | Partly cloudy | 21° /13° | 0 mm | 5 | |
| 30 Sept. | Partly cloudy | 22° /13° | 0 mm | 6 | |
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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.
Change Month
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.
| August | September | October | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 24°/17° | 22°/14° | 20°/13° |
| Rainfall | 112 mm | 144 mm | 103 mm |
| Wind | 13.7 km/h | 14.3 km/h | 16.3 km/h |
| Humidity | 78% | 76% | 75% |
| Rainy days | 21 days | 21 days | 22 days |
| Dry days | 10 days | 9 days | 9 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?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Donostia / San Sebastián during September?
Significant rainfall exceeding 144.3 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 14 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
- Warm Clothing: Sweaters, hoodies, long trousers
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold 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 💧
Typically, Donostia / San Sebastián has 21 rainy days in September with a total of 144.3 mm of rainfall.
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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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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