Early autumn · Weather & things to do
San Sebastián in September
San Sebastián edges cooler than August, with highs of 72°F (22°C), lows of 63°F (17°C) and about 2.5 in (64 mm) of rain.
At 82/100 for comfort (2nd of 12), it's one of the best months to visit.
- Avg high
- 72°F (22°C)
- Avg low
- 63°F (17°C)
- Rain
- 2.5 in (64 mm)
- Humidity
- 76%
- Cloud cover
- 63%
- Daylight
- ~12 h 17 min
- Comfort score
- 82/100 · Great
What September feels like
Warm afternoons near 72°F (22°C) make long days outdoors easy.
Lows average 63°F (17°C).
Showers are part of the month, adding up to about 2.5 in (64 mm).
Plan around September
September is one of San Sebastián's best months on the climate data.
- Last warm month for a while: October highs fall to 67°F.
- Comfort holds steady from August (82 → 82/100).
- September sits inside the May – Oct window our Basque Coast Food Trail route recommends.
What to pack for September
- Light, breathable clothes72°F afternoons
- Packable rain jacket or umbrellaabout 2.5 in of rain
- Comfortable walking shoesmost picks involve some walking
What to do in San Sebastián in September
With conditions on your side, the picks below favor time outside.
Monte Igueldo
Funicular since 1912 up to a viewpoint and old-fashioned amusement park.
Why now September scores 82/100 for comfort, good conditions for being outside.
Peine del Viento
Chillida's steel sculptures anchored into rocks at the end of Ondarreta.
Borda Berri
Small bar making hot pintxos like pork cheek and risotto to order.
Monte Urgull
Wooded hill over the old town with a castle, a statue of Christ and bay views.
Why now Highs near 72°F and 2.5 in of monthly rain make this an easy outdoor pick.
La Concha Beach
Shell-shaped city beach with a long promenade and calm water.
Why now One to do outside while the weather is on your side.
Nearby in September
- Bilbao in September~48 mi · highs 72°F, 2.1 in rain · similar daytime temperatures, about as wet
- Laguardia in September~61 mi · highs 75°F, 1.5 in rain · 1°C (3°F) warmer by day, drier
- Barcelona in September~250 mi · highs 81°F, 2.3 in rain · 5°C (9°F) warmer by day, about as wet
- Girona in September~261 mi · highs 76°F, 2.3 in rain · 2°C (4°F) warmer by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
San Sebastián in September: quick answers
Is September a good time to visit San Sebastián?
Yes. On the climate data it's one of the best months, scoring 82/100. Expect highs of 72°F (22°C) and 2.5 in (64 mm) of rain. September is inside the May – Oct window our Basque Coast Food Trail route recommends.
How hot is San Sebastián in September?
Average highs are 72°F (22°C) and average lows 63°F (17°C), making it the 3rd-warmest month by daytime highs.
Does it rain a lot in San Sebastián in September?
Some: about 2.5 in (64 mm) of rain falls across September on average, the 3rd-driest month of the year. The annual total is about 42.1 in (1070 mm).
What should I pack for San Sebastián in September?
Bring light, breathable clothes (72°F afternoons), packable rain jacket or umbrella (about 2.5 in of rain) and comfortable walking shoes (most picks involve some walking).
More on San Sebastián
Routes in season in September
- Basque Coast Food Trail May – Oct
Planning San Sebastián in September?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.