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Water temperature in San Francisco (CA) in August

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Is it warm enough to swim in San Francisco in August? Average water temperature in San Francisco in August is 57.9°F and therefore is not suitable for comfortable swimming. The warmest sea in San Francisco in August is 64.6°F, and the coldest is 51.3°F. Average high air temperature in San Francisco in August is 68°F, and average low temperature is 55°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in San Francisco

Changes water temperature in San Francisco in August 2025, 2024

To get an accurate forecast for the water temperature in San Francisco for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in San Francisco, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of August.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
August 156.8°F56.8°F52.7°F62.4°F
August 255.6°F54.9°F54°F62.4°F
August 356.3°F57°F54°F62.6°F
August 455.8°F56.5°F54.7°F63.1°F
August 556.1°F57.2°F54°F63°F
August 655.9°F57°F54.1°F62.4°F
August 755.9°F55.8°F54.3°F63.1°F
August 855.4°F56.5°F52°F62.8°F
August 956.7°F56.5°F52.3°F61.9°F
August 1054.5°F56.1°F53.2°F61.7°F
August 1155.2°F56.5°F51.6°F61.9°F
August 1254°F55.8°F51.3°F62.4°F
August 1354.7°F55.6°F52.7°F63.1°F
August 1455.2°F54.1°F53.8°F63.5°F
August 1557.4°F54.9°F54.7°F62.4°F
Day 2025 2024 Min Max
August 1657.2°F54.3°F54.3°F62.1°F
August 1759.2°F54.1°F54.1°F62.1°F
August 1861.5°F55°F52.5°F62.1°F
August 1961.2°F55.9°F55.9°F62.1°F
August 2059.9°F55.9°F55.9°F62.1°F
August 2158.6°F55.6°F55.6°F62.6°F
August 2258.5°F55.4°F55.4°F62.8°F
August 2358.1°F55.9°F55.6°F63°F
August 2458.1°F57.6°F54.9°F63.1°F
August 2558.5°F58.5°F55°F63.1°F
August 2661.3°F58.5°F54.9°F63.9°F
August 2760.8°F58.8°F52.2°F64.6°F
August 2860.4°F58.5°F53.6°F64.2°F
August 2961°F58.3°F54.5°F64°F
August 3061°F59.4°F55.8°F63.5°F
August 3161°F61°F55.9°F63.7°F
San Francisco water temp chart in August

Average water temperature in San Francisco in August over a decade

20162017201820192020
58.3°F59.5°F57.2°F58.3°F56.1°F
20212022202320242025
57.9°F57.7°F57.6°F56.5°F55.9°F

San Francisco sea state in August

Chart comparing the height of waves in San Francisco in August over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in San Francisco in August

Weather and climate in San Francisco in August

This data display average monthly climate indicators in San Francisco in August based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

  • Average HIGH temperature68°F
  • Average LOW temperature55°F
  • Average rainfall days1 days
  • Average rainfall3mm/0.1''
  • Average daylight14h
  • Average sunshine9.3h
  • Average UV index9

San Francisco water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in August?

Want to know where the water temperature in August is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Best Beach Resorts in California in August

Places with the warmest average sea water temperature in California in August. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
San Diego69.8°F62.6°F76.6°F
Santa Monica68.4°F60.8°F74.7°F
La Jolla Cove70.9°F63.5°F77.7°F
Lake Tahoe68°F63.9°F72°F
Los Angeles67.8°F62.2°F72.9°F
Farallon Islands57.4°F51.4°F64.4°F
Linda Mar58.6°F52.9°F64°F
Pacifica State Beach58.6°F52.9°F64°F
Pacifica59.5°F53.1°F65.1°F
Montara58.5°F52.9°F64°F

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for San Francisco is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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