September · Spain
Best time to visit San Sebastian in September Weather, crowds & prices
Weather in San Sebastian in September
Average temperature 19°C, 147 mm of rain, about 25 days with 6+ hours of sunshine and 80% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
6.1/10
Ranked #4 of 12 months
- Avg temp
- 19°C
- Rainfall
- 147 mm
- Humidity
- 80%
- Days with 6h+ sun
- 25
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in San Sebastian scores 6.1/10 for beach and coastal travel - an above-average month (#4 of 12). Expect around 19°C, 147 mm of rain, and roughly 25 days with 6+ hours of sunshine this month.
San Sebastián wraps a shell-shaped bay, pintxos bars and the Basque coast into Spain's gastronomic capital.
September in San Sebastian — workable with trade-offs
With 19°C (67°F) on average, September delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.
147 mm of rain makes this a wet month here, though with about 25 days with 6+ hours of sunshine there is still bright weather between the fronts.
That is 6.1/10 on the same scale — 4th of 12 months, versus 8.4/10 for the best month here.
Pack light clothing, swimwear and real sun protection, a proper rain shell rather than an umbrella.
Expect mid-season pricing, and crowds are moderate.
If your dates are flexible, July is materially better in San Sebastian — 2.3 points higher on the same scale.
Frequently asked
- What is the weather like in San Sebastian in September?
- In September, San Sebastian averages 19°C, 147 mm of rain, and about 25 days with 6+ hours of sunshine. Its climate-comfort score is 6.1/10.
- Is September a good time to visit San Sebastian?
- September earns a 6.1/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in San Sebastian in September?
- Expect about 147 mm of rain in September. Average humidity is 80% and there are about 25 days with 6+ hours of sunshine.
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