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Weather in San Sebastián for September 2025

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

    Temperatures

  • Until now, September 2025 in San Sebastián has been nearly identical to the historical average, with a temperature of 22.1 °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 20.1 °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 noticeably cool down, reaching an average of 20 °C by the end of September.

    • Rain 🌧️

  • San Sebastián experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 95.8 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
8
Dry days
Average rainy days
22
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/14°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
78 %
Avg humidity

San Sebastián Weather September

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

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. Light rain shower
Light rain shower
 22° /14° 6.8 mm 5
2 Sept. Light rain shower
Light rain shower
 19° /14° 11.2 mm 5
3 Sept. Patchy rain possible
Patchy rain possible
 23° /15° 1.4 mm 5
4 Sept. Patchy rain possible
Patchy rain possible
 23° /14° 2.4 mm 5
5 Sept. Partly cloudy
Partly cloudy
 22° /14° 3.4 mm 5
6 Sept. Sunny
Sunny
 23° /13° 1 mm 6
7 Sept. Patchy rain possible
Patchy rain possible
 23° /14° 1.4 mm 5
8 Sept. Patchy rain possible
Patchy rain possible
 22° /13° 1.1 mm 5
9 Sept. Patchy rain possible
Patchy rain possible
 22° /13° 2.9 mm 5
10 Sept. Light rain shower
Light rain shower
 21° /13° 1.8 mm 5
11 Sept. Light rain shower
Light rain shower
 22° /13° 5.4 mm 5
12 Sept. Mist
Mist
 18° /14° 2.6 mm 4
13 Sept. Cloudy
Cloudy
 20° /13° 0.1 mm 5
14 Sept. Cloudy
Cloudy
 23° /14° 0 mm 5
15 Sept. Partly cloudy
Partly cloudy
 22° /14° 0.2 mm 6
16 Sept. Sunny
Sunny
 22° /12° 0 mm 1.3
17 Sept. Sunny
Sunny
 23° /14° 0 mm 1.4
18 Sept. Sunny
Sunny
 27° /15° 0 mm 1.4
19 Sept. Patchy rain possible
Patchy rain possible
 26° /16° 1.7 mm 1
20 Sept. Patchy rain possible
Patchy rain possible
 18° /14° 4.3 mm 0.6
21 Sept. Patchy rain possible
Patchy rain possible
 18° /13° 0.6 mm 3
22 Sept. Patchy rain possible
Patchy rain possible
 16° /11° 0.9 mm 3
23 Sept. Patchy rain possible
Patchy rain possible
 16° /12° 1.2 mm 3
24 Sept. Partly cloudy
Partly cloudy
 18° /10° 0 mm 4
25 Sept. Partly cloudy
Partly cloudy
 18° /11° 0 mm 4
26 Sept. Sunny
Sunny
 19° /10° 0 mm 4
27 Sept. Overcast
Overcast
 19° /11° 0 mm 3
28 Sept. Sunny
Sunny
 20° /11° 0 mm 4
29 Sept. Partly cloudy
Partly cloudy
 22° /13° 0 mm 5
30 Sept. Sunny
Sunny
 24° /15° 0.5 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°/15°21°/14°20°/13°
Rainfall30 mm96 mm135 mm
Wind12.5 km/h13 km/h15.3 km/h
Humidity81%78%77%
Rainy days11 days22 days20 days
Dry days20 days8 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 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 ☀️

Quick links

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Location coordinates 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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