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Water temperature in San Diego (CA) in September

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Is it warm enough to swim in San Diego in September? Average water temperature in San Diego in September is 69.1°F and therefore suitable for comfortable swimming. The warmest sea in San Diego in September is 75.6°F, and the coldest is 63.1°F. Average high air temperature in San Diego in September is 76°F, and average low temperature is 65°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in San Diego

Changes water temperature in San Diego in September 2025, 2024

To get an accurate forecast for the water temperature in San Diego 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 Diego, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of September.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
September 170.5°F69.1°F65.8°F72.9°F
September 270.7°F69.4°F66.4°F73.6°F
September 370.2°F71.1°F64.8°F74.5°F
September 470.2°F72.5°F65.1°F73.6°F
September 569.1°F72.7°F65.5°F73.4°F
September 669.8°F72.7°F65.8°F73.4°F
September 769.4°F73.2°F65.5°F73.9°F
September 869.4°F73°F65.8°F74.1°F
September 968.4°F73.8°F65.5°F74.3°F
September 1068.5°F73.6°F63.3°F74.1°F
September 1168.4°F72.5°F63.5°F74.3°F
September 1267.8°F71.4°F63.3°F75.2°F
September 1367.5°F71.1°F63.1°F75.6°F
September 1467.5°F70.3°F63.5°F75.2°F
September 1568°F69.6°F63.5°F74.7°F
Day 2025 2024 Min Max
September 1668.4°F70.3°F64°F74.1°F
September 1769.1°F69.8°F64°F74.3°F
September 1868.4°F69.4°F64°F74.1°F
September 1968.9°F69.3°F64.2°F74.5°F
September 2068.5°F68.9°F64.2°F75.4°F
September 21 68.7°F64°F75°F
September 22 68.4°F64°F74.7°F
September 23 67.3°F64.2°F74.1°F
September 24 67.3°F64.4°F74.1°F
September 25 67.5°F65.1°F74.3°F
September 26 66°F64.9°F73.9°F
September 27 66.6°F64.9°F74.3°F
September 28 67.6°F65.1°F74.3°F
September 29 65.7°F64.9°F74.3°F
September 30 64.2°F64.2°F73.9°F
San Diego water temp chart in September

Average water temperature in San Diego in September over a decade

20152016201720182019
73.9°F69.1°F70.5°F68.7°F70°F
20202021202220232024
69.3°F67.3°F71.1°F68.7°F69.8°F

San Diego sea state in September

Chart comparing the height of waves in San Diego in September 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 Diego in September

Weather and climate in San Diego in September

This data display average monthly climate indicators in San Diego in September 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 temperature76°F
  • Average LOW temperature65°F
  • Average humidity
    73
  • Average rainfall days1 days
  • Average rainfall5mm/0.2''
  • Average daylight12h
  • Average sunshine8.4h
  • Average UV index8

San Diego 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 September?

Want to know where the water temperature in September 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

San Diego beaches in September

The best beaches with the average ocean water temperature in September. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown.

AvrMinMax
Carlsbad70.2°F61.2°F77°F
Coronado68.2°F62.2°F75.2°F
Oceanside70.3°F63°F77.2°F
La Jolla Shores70.2°F62.6°F77.2°F
Pacific Beach69.6°F63.5°F75.7°F
Mission Beach68.9°F63.1°F75.4°F
Imperial Beach68.2°F62.2°F75.4°F
San Onofre Beach70°F61.9°F76.1°F
Del Mar70.3°F62.1°F78.1°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 Diego 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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