San Sebastián weather in September
San Sebastián in September averages 20°C (67°F), 146 mm of rain and 6 hours of sun a day.
Of the twelve months in San Sebastián, September is the third warmest, the sixth wettest and the fifth sunniest.
- Average temp
- 20°C (67°F)
15–24°C · 59–75°F
- Rainfall
- 146 mm
Showers likely
- Sunshine
- 6 h
hours per day
What is San Sebastián like in September?
Daytime
Days are mild.
Rain
Some rain is likely; pack for showers.
Evening
Evenings are cooler. A layer helps after sunset.
What should I pack for San Sebastián in September?
A light rain jacket
About 146 mm falls this month — showers rather than washouts.
A layer for the evening
Evenings cool off noticeably once the sun is down.
September compared with August and October
September in San Sebastián is 2.2°C cooler than August and 37 mm wetter than it, which averages 22°C (71°F).
September in San Sebastián is 3°C warmer than October and 19 mm drier than it, which averages 17°C (62°F).
Daylight in San Sebastián in September
On 15 September the sun is up for 12 hours 30 minutes in San Sebastián, rising about 07:47 and setting about 20:17 local time.
September ends 1 hour 24 minutes shorter than it begins, so the last week of the month is a different length of day from the first.
That is 2 hours 53 minutes short of June, the longest-lit month here.
Where to stay in San Sebastián
Dates are a starting point for September.
Travel guides for San Sebastián
What to read before you book.
San Sebastián weather by month
TemperatureRainfall
How September compares with the rest of the year
September is highlighted. Every other month links to its own page.
| Month | Average | Rainfall |
|---|---|---|
| January | 9°C / 48°F | 166 mm |
| February | 10°C / 49°F | 143 mm |
| March | 12°C / 54°F | 127 mm |
| April | 13°C / 56°F | 147 mm |
| May | 17°C / 62°F | 133 mm |
| June | 19°C / 67°F | 106 mm |
| July | 21°C / 70°F | 97 mm |
| August | 22°C / 71°F | 110 mm |
| September | 20°C / 67°F | 146 mm |
| October | 17°C / 62°F | 166 mm |
| November | 12°C / 54°F | 224 mm |
| December | 10°C / 50°F | 179 mm |
Check another month
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FAQs about San Sebastián in September
September climate averages for San Sebastián, 1991–2020.
San Sebastián averages 20°C (67°F) in September, ranging from about 15°C (59°F) at night to 24°C (75°F) in the afternoon. That is a 1991–2020 average, so an individual week can run either side of it.
Some. About 146 mm falls across September, enough to need a light jacket but not enough to reshape a trip.
Yes. September averages 20°C (67°F) against 17°C (62°F) in October — 3°C warmer.
September is 2.2°C cooler than August, and 37 mm wetter.
Yes. September falls inside the most comfortable stretch of the year here, May to October, on temperature and rainfall together.
About 6 hours of sun a day on the 1991–2020 average.
This page does not show today's weather. It is a 1991–2020 climate normal from Meteostat — a long-run average of what September is usually like, which is what you want when booking months ahead. For today or the coming week, check a live forecast.
About 12 hours 30 minutes of daylight in mid-September, against 15 hours 23 minutes in June and 8 hours 59 minutes in December.
On 15 September, sunrise is about 07:47 and sunset about 20:17 local time. Both shift across the month — the month ends 1 hour 24 minutes shorter than it starts.
