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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 21.3 °C. As the month progressed, temperatures tended to slightly decrease, reaching an average of 21.1 °C by the end of September.

  • Expect significant rainfall in San Sebastián during September, with an average of 18 rainy days.

  • Is September a good time to visit San Sebastián? check out the best time to travel to San Sebastián page.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
12
Dry days
Average rainy days
18
Rainy days
Average snowy days
0
Snow days
Average temperatures
23°/16°
Temperatures
Average wind speed
12 km/h
Avg max wind
Average humidity
74 %
Avg humidity

San Sebastián in September average weather

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Temperatures trend during September in San Sebastián

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Cloudy
Cloudy
22° /15° 2.4 mm 5
2 Sept. Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
19° /15° 14.4 mm 5
3 Sept. Partly cloudy
Partly cloudy
20° /15° 2.9 mm 5
4 Sept. Patchy rain possible
Patchy rain possible
22° /16° 7.7 mm 5
5 Sept. Sunny
Sunny
21° /15° 8.2 mm 6
6 Sept. Patchy rain possible
Patchy rain possible
22° /15° 2.8 mm 5
7 Sept. Partly cloudy
Partly cloudy
23° /15° 0.8 mm 6
8 Sept. Partly cloudy
Partly cloudy
23° /16° 0.7 mm 6
9 Sept. Patchy light rain with thunder
Patchy light rain with thunder
23° /15° 2.4 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
21° /15° 2.2 mm 5
11 Sept. Patchy light rain with thunder
Patchy light rain with thunder
21° /15° 2.4 mm 5
12 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
18° /14° 12.7 mm 4
13 Sept. Partly cloudy
Partly cloudy
18° /13° 1 mm 5
14 Sept. Partly cloudy
Partly cloudy
21° /12° 0 mm 6
15 Sept. Thundery outbreaks possible
Thundery outbreaks possible
22° /13° 0 mm 6
16 Sept. Patchy light drizzle
Patchy light drizzle
22° /14° 0.2 mm 6
17 Sept. Partly cloudy
Partly cloudy
21° /15° 0.3 mm 5
18 Sept. Patchy rain possible
Patchy rain possible
21° /14° 0.8 mm 6
19 Sept. Patchy rain possible
Patchy rain possible
21° /14° 2 mm 5
20 Sept. Sunny
Sunny
22° /14° 3.2 mm 6
21 Sept. Light rain shower
Light rain shower
20° /14° 6.8 mm 5
22 Sept. Light rain shower
Light rain shower
16° /13° 5 mm 4
23 Sept. Patchy rain possible
Patchy rain possible
19° /11° 0.2 mm 5
24 Sept. Sunny
Sunny
20° /13° 0.9 mm 5
25 Sept. Sunny
Sunny
24° /14° 0.2 mm 6
26 Sept. Patchy rain possible
Patchy rain possible
21° /15° 12.3 mm 5
27 Sept. Cloudy
Cloudy
19° /13° 3.1 mm 5
28 Sept. Sunny
Sunny
19° /12° 2.3 mm 5
29 Sept. Patchy rain possible
Patchy rain possible
22° /14° 0.1 mm 6
30 Sept. Sunny
Sunny
23° /15° 0 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?
During September, expect a variety of temperatures with highs around 23° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in San Sebastián during September?
Moderate rainfall is anticipated in San Sebastián during September, with a total of 90.2 mm spread over approximately 18 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 12 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
    • 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 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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Location coordinates 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.

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