19.09
sat
sat
Day
68°F
S 2 mph
Precip.
6%
6%
Night
55°F
N 2 mph
Precip.
19%
19%
20.09
sun
sun
Day
72°F
S 4 mph
Precip.
2%
2%
Night
57°F
N 3 mph
Precip.
30%
30%
21.09
mon
mon
Day
73°F
S 4 mph
Precip.
2%
2%
Night
59°F
N 4 mph
Precip.
9%
9%
22.09
tue
tue
Day
72°F
SE 5 mph
Precip.
8%
8%
Night
57°F
N 5 mph
Precip.
1%
1%
23.09
wed
wed
Day
77°F
S 4 mph
Precip.
1%
1%
Night
63°F
N 4 mph
Precip.
9%
9%
24.09
thu
thu
Day
82°F
NW 3 mph
Precip.
1%
1%
Night
66°F
N 4 mph
Precip.
5%
5%
25.09
fri
fri
Day
81°F
NW 2 mph
Precip.
1%
1%
Night
66°F
N 5 mph
Precip.
14%
14%
sea water
temperature
temperature
| San Sebastian |
monthly
weather
weather
| San Sebastian |
current
weather
weather
| San Sebastian |
14 days
forecast
forecast
| San Sebastian |
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 72.9°F. The highest and lowest sea temperatures during the month were 73.8°F and 71.4°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 66.4°F. The highest and lowest sea temperatures during the month were 68.7°F and 63.7°F.
Air temperature in San Sebastian, °F
Precipitation total in San Sebastian, in.
* Charts above show average data for the last 3 years.
Best time for vacation in San Sebastian
San Sebastian on a weather map
Places in Spain:
Name
°F
24 Hours Forecast
San Sebastian
Local time: 18:25
September 19, saturday
2100
57°F
W
1 mph
1 mph
September 20, sunday
0000
55°F
N
2 mph
2 mph
0300
55°F
N
3 mph
3 mph
0600
55°F
N
4 mph
4 mph
0900
59°F
N
3 mph
3 mph
1200
72°F
S
4 mph
4 mph
1500
77°F
S
7 mph
7 mph
1800
72°F
S
4 mph
4 mph
