Current sea water temperature:
+58.5°F
| Minimum sea water temperature in December: | 61.3°F |
| Maximum sea water temperature in December: | 53.8°F |
| Average sea water temperature in December: | 57.5°F |
| more information | |
14 days
forecast
forecast
| San Sebastian |
monthly
weather
weather
| San Sebastian |
Sea water temperature for the last 10 days:
| December 18 | 58.5°F | December 13 | 58.5°F |
| December 17 | 58.6°F | December 12 | 58.5°F |
| December 16 | 58.5°F | December 11 | 58.8°F |
| December 15 | 58.3°F | December 10 | 59.0°F |
| December 14 | 58.1°F | December 9 | 58.8°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:
2025
2024
2023
The average sea water temperature in August of 2025 was 73.8°F. The highest and lowest sea temperatures during the month were 75.9°F and 72.1°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 73.7°F. The highest and lowest sea temperatures during the month were 75.0°F and 72.3°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
December
December
| 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: 09:10
December 18, thursday
1200
59°F
N
15 mph
15 mph
1500
61°F
N
16 mph
16 mph
1800
55°F
N
14 mph
14 mph
2100
55°F
N
13 mph
13 mph
December 19, friday
0000
54°F
N
9 mph
9 mph
0300
52°F
N
7 mph
7 mph
0600
52°F
N
6 mph
6 mph
0900
52°F
NE
4 mph
4 mph
