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Water temperature in Foster City (CA) in August

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Is it warm enough to swim in Foster City in August? Average water temperature in Foster City in August is 62.2°F and therefore is not suitable for comfortable swimming. The warmest sea in Foster City in August is 75.4°F, and the coldest is 54.3°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Foster City

Changes water temperature in Foster City in August 2025, 2024

To get an accurate forecast for the water temperature in Foster City for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Foster City, 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 164.2°F68.4°F54.3°F72.9°F
August 262.8°F70.2°F54.3°F72.1°F
August 363°F69.8°F54.9°F71.4°F
August 465.1°F68.4°F55°F71.1°F
August 567.1°F70°F55°F70°F
August 668.2°F69.4°F55.4°F69.4°F
August 769.1°F70.7°F55.6°F71.2°F
August 870.5°F70.2°F55.8°F71.1°F
August 971.2°F71.6°F55.9°F72.1°F
August 1071.8°F69.3°F55.9°F71.8°F
August 1171.8°F69.6°F55.9°F71.8°F
August 1270.3°F68.5°F56.1°F71.1°F
August 1370°F67.3°F56.3°F71.8°F
August 1471.2°F67.3°F56.3°F71.6°F
August 1569.6°F67.1°F56.3°F72.5°F
Day 2025 2024 Min Max
August 1668.9°F68°F56.5°F73.8°F
August 1769.1°F69.1°F56.3°F73.6°F
August 1869.4°F67.6°F56.5°F72.3°F
August 1968.9°F69.1°F56.5°F72.3°F
August 2069.6°F68.9°F56.7°F72.7°F
August 2171.6°F69.1°F56.5°F73.8°F
August 2271.4°F68.5°F56.5°F73.2°F
August 2371.2°F67.1°F56.3°F73°F
August 2471.4°F67.1°F56.5°F74.7°F
August 2571.4°F67.8°F56.5°F75.4°F
August 2670.2°F69.3°F56.8°F73.2°F
August 2769.6°F70.2°F57.2°F71.8°F
August 2870.2°F71.6°F56.7°F72°F
August 2970.2°F70.7°F56.5°F72.5°F
August 3070°F71.6°F56.5°F71.8°F
August 3170.9°F70.5°F56.5°F72.3°F
Foster City water temp chart in August

Average water temperature in Foster City in August over a decade

20162017201820192020
58.8°F60.6°F59.7°F69.6°F66.9°F
20212022202320242025
70.9°F70.3°F71.4°F69.1°F66.7°F

Foster City sea state in August

Chart comparing the height of waves in Foster City 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 Foster City in August

Foster City 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
Millbrae62.4°F54.1°F75°F
Mountain View61.7°F54.3°F72.7°F
Palo Alto61.7°F54.3°F72.7°F
San Leandro62.6°F54.1°F76.3°F
Oakland62.6°F54.1°F75.2°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 Foster City 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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