Current sea water temperature:
+73.0°F
| Minimum sea water temperature in September: | 74.3°F |
| Maximum sea water temperature in September: | 66.6°F |
| Average sea water temperature in September: | 70.4°F |
| more information | |
14 days
forecast
forecast
| San Sebastian |
monthly
weather
weather
| San Sebastian |
Sea water temperature for the last 10 days:
| September 14 | 73.0°F | September 9 | 73.0°F |
| September 13 | 72.9°F | September 8 | 73.2°F |
| September 12 | 72.5°F | September 7 | 73.6°F |
| September 11 | 73.2°F | September 6 | 73.4°F |
| September 10 | 72.9°F | September 5 | 73.4°F |
Monthly sea water temperature, °F
When is the warmest sea in San Sebastian?
Based on the data about daily sea water temperature for the last three years the warmest sea in San Sebastian was noticed in August, July and September.
Monthly Sea Temperatures in San Sebastian, °F
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 75.0°F. The highest and lowest sea temperatures during the month were 76.3°F and 73.8°F.
Sea water temperature in July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 75.8°F. The highest and lowest sea temperatures during the month were 77.2°F and 74.5°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 70.2°F. The highest and lowest sea temperatures during the month were 72.0°F and 68.2°F.
current
weather
weather
| San Sebastian |
weather in
September
September
| San Sebastian |
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: 17:17
September 14, monday
1800
81°F
S
4 mph
4 mph
2100
68°F
NW
3 mph
3 mph
September 15, tuesday
0000
66°F
N
4 mph
4 mph
0300
66°F
N
4 mph
4 mph
0600
64°F
N
4 mph
4 mph
0900
68°F
N
4 mph
4 mph
1200
79°F
SE
6 mph
6 mph
1500
77°F
SE
8 mph
8 mph
