Average Ocean Water Temperatures at San Francisco

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The table below lists typical water temperatures for each month of the year in the ocean off San Francisco in California.

The temperatures, given in both degrees Fahrenheit and degrees Celsius, are long-term averages.

The water is measured at Fort Point, which is near the southern end of the Golden Gate Bridge and at the entrance to San Francisco Bay.

The ocean off San Francisco is at its warmest from mid August to late September when the temperature averages 60 degrees Fahrenheit (15.5 degrees Celsius).

The coolest months are January and February, when the sea temperature is typically at 53 °F (11.7 ° C).

San Francisco's average seawater temperature
Period °F °C
January 53 12
February 53 12
March 54 12
April 1-15 54 12
April 16-30 55 13
May 1-15 55 13
May 16-31 55 13
June 1-15 56 13
June 16-30 58 14
July 1-15 58 14
July 16-31 58 14
August 1-15 59 15
August 16-31 60 16
September 1-15 60 16
September 16-30 60 16
October 1-15 59 15
October 16-31 58 14
November 56 13
December 55 13
Annual Average 56 13
Reference

National Oceanographic Data Center. NODC Coastal Water Temperature Guide (CWTG).

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