Weather in Donostia / San Sebastián for September 2025
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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Donostia / San Sebastián in September average weather
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
September weather day by day
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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Donostia / San Sebastián in September - FAQ
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
UV exposure in Donostia / San Sebastián during September
Quick links
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.