San Francisco Bay water temp
This data the coastal San Francisco Bay ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.
Current ocean temperature in San Francisco Bay
Water temperature in San Francisco Bay today is 66.6°F. Based on our historical data over a period of ten years, the warmest water in this day in San Francisco Bay was recorded in 2019 and was 67.1°F, and the coldest 56.7°F. Sea water temperature in San Francisco Bay is expected to drop to 61.2°F in the next 10 days. September average water temperature in San Francisco Bay is 62.1°F, the minimum temperature is 55.6°F, and the maximum is 69.4°F.
Throughout the year, the water temperature in San Francisco Bay does not rise above 68°F and therefore is not suitable for comfortable swimming. But on some days of August, September, the water temperature warms up to 68°F and above. The average water temperature in San Francisco Bay in winter reaches 52.5°F, in spring 55.8°F, in summer the average temperature rises to 60.3°F, and in autumn it is 59.9°F.
San Francisco Bay water temperature now
| September 26, 2025 |
|---|
| today temp |
| 66.6°F |
| September 25, 2025 |
|---|
| yesterday temp |
| 66.9°F |
The ocean salinity in San Francisco Bay is 25.14‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in San Francisco Bay for today
Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for San Francisco Bay. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast San Francisco Bay. Data in table shown for September 26, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 1' 2" | 1' 1" | 1' 3" | 1' 5" |
| 0.35 m | 0.33 m | 0.37 m | 0.43 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 1' 6" | 1' 7" | 1' 7" | 1' 7" |
| 0.45 m | 0.47 m | 0.47 m | 0.48 m |
Surf report in San Francisco Bay
San Francisco Bay weather forecast
Current temperature and weather
Data in a table show San Francisco Bay temperature today (September 26, 2025). For more information and forecast for a few days, go to the weather forecast San Francisco Bay.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 |  |  | |
| 59.2°F | 58.3°F | 57.6°F | 60.8°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
 | | |  |
| 66°F | 68.4°F | 64.8°F | 60.4°F |
You may also be interested in other sections of our site for San Francisco Bay: Sunrise and Sunset, Tides
San Francisco Bay water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in San Francisco Bay. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in San Francisco Bay on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve
Chart monthly average water temperature in San Francisco Bay
