San Sebastián
September
Weather in San Sebastián for September 2025
Your guide to San Sebastián weather in September - trends and predictions
In general, the average temperature in San Sebastián at the beginning of September is 21.4 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 22.1 °C by the end of September.
San Sebastián experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 95.8 mm.
Is September a good time to visit San Sebastián? check out the best time to travel to San Sebastián page.
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Temperatures
Rain 🌧️
More
8
Dry days
22
Rainy days
0
Snow days
21°/14°
Temperatures
13 km/h
Avg max wind
78 %
Avg humidity
San Sebastián in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  22° | 2 17° | 3  21° | 4  23° | 5  22° | 6  22° | 7 23° |
| 8 24° | 9 23° | 10 21° | 11 21° | 12 18° | 13  20° | 14 21° |
| 15 23° | 16 22° | 17 23° | 18 21° | 19 21° | 20  23° | 21 19° |
| 22 19° | 23 20° | 24 22° | 25 24° | 26 21° | 27 20° | 28 21° |
| 29 23° | 30 24° |
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Temperatures trend during September in 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. | Light rain shower | 22° /15° | 10.1 mm | 5 | |
| 2 Sept. | Light rain shower | 17° /14° | 16.8 mm | 4 | |
| 3 Sept. | Mist | 21° /14° | 2.1 mm | 5 | |
| 4 Sept. | Patchy light rain | 23° /15° | 3.6 mm | 6 | |
| 5 Sept. | Partly cloudy | 22° /14° | 5.1 mm | 6 | |
| 6 Sept. | Sunny | 22° /13° | 1.6 mm | 6 | |
| 7 Sept. | Patchy rain possible | 23° /14° | 1.8 mm | 6 | |
| 8 Sept. | Patchy rain possible | 24° /14° | 1.6 mm | 6 | |
| 9 Sept. | Light rain shower | 23° /15° | 4.3 mm | 6 | |
| 10 Sept. | Light rain shower | 21° /13° | 1.5 mm | 5 | |
| 11 Sept. | Light rain shower | 21° /14° | 7.7 mm | 5 | |
| 12 Sept. | Mist | 18° /14° | 3.9 mm | 4 | |
| 13 Sept. | Cloudy | 20° /13° | 0.2 mm | 5 | |
| 14 Sept. | Cloudy | 21° /13° | 0 mm | 5 | |
| 15 Sept. | Partly cloudy | 23° /13° | 0 mm | 7 | |
| 16 Sept. | Patchy light drizzle | 22° /13° | 0.6 mm | 6 | |
| 17 Sept. | Patchy rain possible | 23° /13° | 1.3 mm | 6 | |
| 18 Sept. | Light rain shower | 21° /13° | 0.9 mm | 5 | |
| 19 Sept. | Partly cloudy | 21° /14° | 0 mm | 6 | |
| 20 Sept. | Overcast | 23° /13° | 2.1 mm | 5 | |
| 21 Sept. | Light rain shower | 19° /14° | 6.5 mm | 4 | |
| 22 Sept. | Light rain shower | 19° /12° | 3.5 mm | 4 | |
| 23 Sept. | Sunny | 20° /11° | 0.1 mm | 6 | |
| 24 Sept. | Sunny | 22° /12° | 1.2 mm | 6 | |
| 25 Sept. | Sunny | 24° /13° | 1.7 mm | 6 | |
| 26 Sept. | Patchy rain possible | 21° /14° | 13 mm | 5 | |
| 27 Sept. | Sunny | 20° /13° | 3 mm | 5 | |
| 28 Sept. | Sunny | 21° /13° | 1 mm | 6 | |
| 29 Sept. | Patchy rain possible | 23° /14° | 0 mm | 5 | |
| 30 Sept. | Sunny | 24° /15° | 0.5 mm | 6 | |
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Important Notice
Our weather forecast for 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 San Sebastián forecast closer to your planned date for the most up-to-date weather information.
San Sebastián in September - FAQ
What are the expected maximum and minimum temperatures in San Sebastián during September?
Enjoy moderate daytime temperatures of up to 21° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in San Sebastián during September?
Moderate rainfall is anticipated in San Sebastián during September, with a total of 95.8 mm spread over approximately 22 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in San Sebastián during September?
The average wind speed in San Sebastián during September is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to San Sebastián in September?
As you prepare for your trip to 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 San Sebastián, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long 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
- 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 San Sebastián
Explore the daily rainfall trends and prepare for San Sebastiáns September weather 💧
UV exposure in San Sebastián during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Where is San Sebastián?Get accurate weather forecasts for San Sebastián, located at latitude 43.567 and longitude -5.9. Stay updated with localized weather information tailored for San Sebastián.
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