Month-by-month travel weather
San Sebastian September weather
San Sebastian, Spain · September
Layer + waterproof option is the efficient combo
September often feels excellent for walking—still warm by day, with cooler evenings returning.
As autumn approaches, rain becomes more frequent. Keeping a waterproof option helps plans run smoother.
September averages at a glance
Average low
around 15–17°C
Average high
around 21–23°C
Average rainfall
around 90–170 mm
Rainy days
about 10–14 days
What to wear in September in San Sebastian
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Mix of T-shirts/long sleeves + thin outer layer.
- • Waterproof jacket option helps.
- • Evening layer helps with breeze.
Travel tips for visiting San Sebastian in September
- • Keep routes flexible on rain-risk days.
- • Clear days are great for longer coastal walks.
September weather in San Sebastian — FAQ
Q. Is September still summer?
A. It often feels summer-like by day, with more fall-like evenings.
Q. Does rain increase from September?
A. It can—autumn tends to get wetter.
Explore San Sebastian
These pages are connected so you can compare conditions and decide for yourself.