San Sebastián Weather in September
Thinking of visiting San Sebastián in September? Expect high temperatures reaching 22°C (72°F) during the day, dropping to 16°C (61°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in San Sebastián in September
On average, there are about 13 days with rain during this month, averaging 104 mm (4.1 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in San Sebastián in September
In September, San Sebastián gets high temperatures, with highs of 22°C (72°F). Nights cool to around 16°C (61°F). September is a notable month of the summer season. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights drop to around 16°C (61°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in San Sebastián in September
The area enjoys a moderate level of sunlight, with around 170 hours. It's a good balance between sunny and cloudy days.If you prefer dry days with pleasant temperatures, June, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Spain, check out our San Sebastián's climate page.
San Sebastián Temperature in September
Min Temperature
16°C (61°F)
Max Temperature
22°C (72°F)
Chance of Rain
43%
Precipitation
104 mm (4.1 in)
Rainy days
13 days
Humidity
75%
Sunshine
170 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Sebastián typically stay consistent throughout September, with daily highs averaging around 22°C (72°F). Nights are pleasant, with lows typically ranging from 13°C (55°F) to 16°C (61°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for San Sebastián in September
Browse day-by-day weather records for San Sebastián spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Sebastián historical weather extremes in September
The extremes listed below come from historical weather data collected in San Sebastián from 1976 through 2025.
- San Sebastián recorded its highest September temperature of 37°C (99°F) on September 12, 2016.
- The coldest September day was on September 25, 1993, with a maximum of 15°C (59°F).
- San Sebastián registered its coldest September night on September 19, 2001, with temperatures dropping to 1°C (34°F).
Best Places in Spain in September
Find out more about the weather in Spain and which places have the best travel conditions in this month. See all of Spain in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in San Sebastián in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in San Sebastián in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Spain, check out our San Sebastián's climate page.
Temperature Rainfall Sunshine Humidity
See the full San Sebastián climate overview or explore weather in Spain.
