Current sea water temperature:
+53.2°F
| Minimum sea water temperature in December: | 59.2°F |
| Maximum sea water temperature in December: | 50.2°F |
| Average sea water temperature in December: | 54.1°F |
| more information | |
14 days
forecast
forecast
| San Francisco |
monthly
weather
weather
| San Francisco |
Sea water temperature for the last 10 days:
| December 17 | 53.2°F | December 12 | 54.3°F |
| December 16 | 53.4°F | December 11 | 54.5°F |
| December 15 | 53.4°F | December 10 | 54.5°F |
| December 14 | 53.6°F | December 9 | 54.7°F |
| December 13 | 54.7°F | December 8 | 56.1°F |
Monthly sea water temperature, °F
When is the warmest sea in San Francisco?
Based on the data about daily sea water temperature for the last three years the warmest sea in San Francisco was noticed in September, August and October.
Monthly Sea Temperatures in San Francisco, °F
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 64.8°F. The highest and lowest sea temperatures during the month were 66.9°F and 62.2°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 63.8°F. The highest and lowest sea temperatures during the month were 65.1°F and 62.4°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 63.8°F. The highest and lowest sea temperatures during the month were 65.3°F and 62.4°F.
current
weather
weather
| San Francisco |
weather in
December
December
| San Francisco |
Best time for vacation in San Francisco
San Francisco on a weather map
Places in USA:
Name
°F
24 Hours Forecast
San Francisco
Local time: 14:45
December 17, wednesday
1500
57°F
E
7 mph
7 mph
1800
54°F
E
8 mph
8 mph
2100
52°F
E
5 mph
5 mph
December 18, thursday
0000
50°F
E
5 mph
5 mph
0300
48°F
E
6 mph
6 mph
0600
48°F
E
3 mph
3 mph
0900
50°F
NE
2 mph
2 mph
1200
50°F
E
2 mph
2 mph
