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Weather in San Sebastián for September 2025

Your guide to San Sebastián weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Yellow High Temperature Warning - See hour by hour.

    • Temperatures

  • Until now, September 2025 in San Sebastián has been nearly identical to the historical average, with a temperature of 20.9 °C (showing only a slight deviation of -0.4 °C).

  • Expect cooler weather in the next days in San Sebastián with the forecast suggesting a temperature of 18.7 °C, lower than the historical average.

  • In general, the average temperature in San Sebastián at the beginning of September is 22.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.7 °C by the end of September.

    • Rain 🌧️

  • San Sebastián in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 97.8 mm.

    • More

  • 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
21°/14°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
76 %
Avg humidity

San Sebastián Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
21°
2
Moderate or heavy rain with thunder
20°
3
Partly cloudy
22°
4
Patchy rain possible
21°
5
Sunny
22°
6
Patchy rain possible
25°
7
Partly cloudy
24°
8
Partly cloudy
21°
9
Patchy light rain with thunder
21°
10
Patchy rain possible
20°
11
Patchy light rain with thunder
21°
12
Light rain shower
18°
13
Partly cloudy
18°
14
Partly cloudy
23°
15
Thundery outbreaks possible
21°
16
Weather Alert Patchy rain possible
23°
17
Weather Alert Sunny
23°
18
Weather Alert Sunny
28°
19
Partly cloudy
28°
20
Moderate rain
24°
21
Patchy rain possible
16°
22
Moderate rain
14°
23
Patchy rain possible
12°
24
Partly cloudy
15°
25
Sunny
16°
26
Sunny
17°
27
Patchy rain possible
16°
28
Moderate rain
15°
29
Moderate rain
15°
30
Sunny
23°

Temperatures trend during September in San Sebastián

See the weather trend as well as the moving average line

September weather in San Sebastián day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
 21° /15° 1.9 mm 5
2 Sept. Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 20° /14° 9.6 mm 5
3 Sept. Partly cloudy
Partly cloudy
 22° /15° 2.2 mm 5
4 Sept. Patchy rain possible
Patchy rain possible
 21° /15° 5.6 mm 5
5 Sept. Sunny
Sunny
 22° /14° 5.5 mm 6
6 Sept. Patchy rain possible
Patchy rain possible
 25° /16° 1.9 mm 6
7 Sept. Partly cloudy
Partly cloudy
 24° /16° 0.8 mm 5
8 Sept. Partly cloudy
Partly cloudy
 21° /15° 3.3 mm 5
9 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 21° /14° 1.8 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
 20° /15° 2.5 mm 4
11 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 21° /14° 2.9 mm 5
12 Sept. Light rain shower
Light rain shower
 18° /14° 10 mm 4
13 Sept. Partly cloudy
Partly cloudy
 18° /13° 0.6 mm 5
14 Sept. Partly cloudy
Partly cloudy
 23° /13° 0 mm 6
15 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 21° /13° 1 mm 5
16 Sept. Patchy rain possible
Patchy rain possible
 23° /16° 0.3 mm 1.3
17 Sept. Sunny
Sunny
 23° /16° 0 mm 1.4
18 Sept. Sunny
Sunny
 28° /18° 0 mm 1.4
19 Sept. Partly cloudy
Partly cloudy
 28° /19° 0 mm 0.8
20 Sept. Moderate rain
Moderate rain
 24° /14° 5.6 mm 0.5
21 Sept. Patchy rain possible
Patchy rain possible
 16° /13° 4.5 mm 3
22 Sept. Moderate rain
Moderate rain
 14° /10° 5.4 mm 3
23 Sept. Patchy rain possible
Patchy rain possible
 12° /11° 1.5 mm 3
24 Sept. Partly cloudy
Partly cloudy
 15° /10° 0.1 mm 4
25 Sept. Sunny
Sunny
 16° /9° 0 mm 4
26 Sept. Sunny
Sunny
 17° /10° 0 mm 4
27 Sept. Patchy rain possible
Patchy rain possible
 16° /12° 2.6 mm 3
28 Sept. Moderate rain
Moderate rain
 15° /14° 9.3 mm 3
29 Sept. Moderate rain
Moderate rain
 15° /14° 8.9 mm 3
30 Sept. Sunny
Sunny
 23° /15° 0 mm 6
Next
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.
Change Month
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San Sebastián weather in September vs August vs October

Compare September weather in 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.
AugustSeptemberOctober
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures22°/16°21°/14°20°/13°
Rainfall69 mm98 mm130 mm
Wind12.8 km/h13.6 km/h16.1 km/h
Humidity78%76%73%
Rainy days13 days18 days20 days
Dry days18 days12 days11 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?
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 97.8 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 14 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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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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