Weather in San Sebastián for September 2027
In general, the average temperature in San Sebastián at the beginning of September is 23.3 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 21.1 °C by the end of September.
The climate of San Sebastián in September is notably wet, with an average of 12 rainy days, and a total of 81.1 mm of precipitation.
Is September a good time to visit San Sebastián? check out the best time to travel to San Sebastián page.
✨ Is September a good time to visit San Sebastián? – Ask the AI Weatherman
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San Sebastián Weather September
Temperatures trend during September in San Sebastián
September weather in San Sebastián day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 22° /14° | 1.4 mm | 5 | |
| 2 Sept. |  Moderate or heavy rain with thunder | 21° /14° | 7.2 mm | 5 | |
| 3 Sept. | Patchy rain possible | 23° /15° | 1.6 mm | 5 | |
| 4 Sept. |  Light rain | 23° /16° | 4.2 mm | 5 | |
| 5 Sept. | Light rain | 24° /15° | 4.1 mm | 5 | |
| 6 Sept. | Patchy rain possible | 27° /16° | 1.4 mm | 6 | |
| 7 Sept. |  Partly cloudy | 24° /16° | 0.6 mm | 6 | |
| 8 Sept. | Light rain | 22° /15° | 6.3 mm | 5 | |
| 9 Sept. |  Patchy light rain with thunder | 20° /14° | 2.4 mm | 4 | |
| 10 Sept. | Patchy rain possible | 21° /14° | 1.9 mm | 4 | |
| 11 Sept. | Patchy light rain with thunder | 21° /14° | 2.2 mm | 5 | |
| 12 Sept. | Light rain | 19° /14° | 7.5 mm | 4 | |
| 13 Sept. | Partly cloudy | 20° /13° | 0.5 mm | 5 | |
| 14 Sept. | Partly cloudy | 25° /14° | 0 mm | 6 | |
| 15 Sept. |  Thundery outbreaks possible | 21° /15° | 1.2 mm | 5 | |
| 16 Sept. | Light rain | 21° /14° | 3.9 mm | 4 | |
| 17 Sept. | Partly cloudy | 21° /14° | 0.7 mm | 4 | |
| 18 Sept. | Patchy rain possible | 22° /14° | 1.2 mm | 5 | |
| 19 Sept. | Patchy rain possible | 23° /14° | 1.1 mm | 5 | |
| 20 Sept. | Patchy rain possible | 22° /14° | 2.1 mm | 5 | |
| 21 Sept. | Light rain | 20° /13° | 6.3 mm | 4 | |
| 22 Sept. | Light rain | 18° /13° | 7.1 mm | 4 | |
| 23 Sept. | Light rain | 19° /12° | 2.7 mm | 4 | |
| 24 Sept. |  Sunny | 22° /13° | 0.4 mm | 5 | |
| 25 Sept. | Sunny | 21° /13° | 0.1 mm | 5 | |
| 26 Sept. | Light rain | 21° /13° | 6.1 mm | 4 | |
| 27 Sept. | Patchy rain possible | 20° /14° | 2 mm | 4 | |
| 28 Sept. | Patchy rain possible | 20° /13° | 1.1 mm | 4 | |
| 29 Sept. | Patchy rain possible | 22° /15° | 0.2 mm | 4 | |
| 30 Sept. | Light rain | 22° /14° | 3.4 mm | 4 | |
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San Sebastián weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 24°/16° | 21°/14° | 19°/13° |
| Rainfall | 60 mm | 81 mm | 114 mm |
| Wind | 13.2 km/h | 13 km/h | 14.3 km/h |
| Humidity | 77% | 74% | 75% |
| Rainy days | 11 days | 12 days | 13 days |
| Dry days | 20 days | 18 days | 18 days |
Planning a trip to San Sebastián? Discover the best time to visit
San Sebastián in September - FAQ
What are the expected maximum and minimum temperatures in San Sebastián during September?
How much rainfall should be expected in San Sebastián during September?
What are the typical wind conditions in San Sebastián during September?
September rainfall patterns in San Sebastián
UV exposure in San Sebastián during September
What to pack to San Sebastián in September?
Mild · highs around 21 °C, frequent showers
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
👟 Footwear
🎒 Accessories
Where is San Sebastián?Get accurate weather forecasts for San Sebastián, located at latitude 43.201 and longitude -4.423. Stay updated with localized weather information tailored for San Sebastián.