Swimming in San Sebastian in september 2025: Average sea temperature in september and tide times in september 2025
Average sea temperature in San Sebastian in september 2025.
In september, according to seasonal norms, the sea temperature in San Sebastian is:
Minimum: 66°F
Average: 70°F
Maximum: 74°F
Other useful seasonal weather averages in september:
- Outside temperature: 63°F to 73°F
- Most common weather: "Clear/Sunny"
- The wind blows at 10.6mph
- It rains a total of 3.9in, over 6 day(s).
Should we swim in San Sebastian in september?
Yes... and no. The water temperature in San Sebastian in september is cool
Swimming in september on the beaches of San Sebastian is possible but the sea water is cool. So even though the sea temperature sometimes climbs to 74°F, it can also be as low as 66°F! Note that the average is 70°F.
Note also that in september, the climate is good with an average outside temperature of 68°F, 3.9in of precipitation (over 6 days) and 82.74 % humidity.
Water and normal seasonal temperatures in San Sebastian in september
| September | |||
| Average sea temperature | 70°F | ||
| Minimum sea temperature | 66°F | ||
| Maximum sea temperature | 74°F | ||
| Average outside temperature | 68°F | ||
| Maximum outside temperature | 74°F | ||
| Minimum outside temperature | 63°F | ||
| Wind speed | 9.3mph | ||
| Wind temperature | 63°F | ||
| Precipitation | 3.9in | ||
| Number of days of rain | 6 jour(s) (21%) | ||
| Humidity | 83% | ||
| Visibility in kilometers | 9.53km | ||
| Cloud cover | 34% | ||
| Our opinion | cool swimming |
Chart of the tides in september 2025
Tide times in september 2025 in San Sebastian
Swim elsewhere in Spain in september
| City | Average T° | Min. T° | Max. T° | Our opinion | Alicante in september | 77°F | 81°F | pleasant swimming | Barcelona in september | 76°F | 81°F | pleasant swimming | Bilbao in september | 70°F | 73°F | cool swimming | Lloret de Mar in september | 74°F | 79°F | pleasant swimming | Malaga in september | 72°F | 75°F | pleasant swimming | Salou in september | 76°F | 80°F | pleasant swimming | Valencia in september | 77°F | 80°F | pleasant swimming | A Coruña in september | 66°F | 69°F | cool swimming | Almeria in september | 74°F | 78°F | pleasant swimming | Benidorm in september | 77°F | 80°F | pleasant swimming | Cartagena in september | 76°F | 80°F | pleasant swimming | Costa del Sol in september | 72°F | 76°F | pleasant swimming | Gibraltar in september | 72°F | 76°F | pleasant swimming | Gijon in september | 68°F | 72°F | cool swimming | Llanes in september | 69°F | 72°F | cool swimming | Marbella in september | 72°F | 75°F | pleasant swimming | Nerja in september | 72°F | 76°F | pleasant swimming | Santander in september | 69°F | 73°F | cool swimming | Torremolinos in september | 72°F | 76°F | pleasant swimming | Vigo in september | 66°F | 68°F | cool swimming |