World sea water temperatures

Water temperature in Oceanside (CA) in September

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Is it warm enough to swim in Oceanside in September? Average water temperature in Oceanside in September is 70.3°F and therefore suitable for comfortable swimming. The warmest sea in Oceanside in September is 77.2°F, and the coldest is 63°F. Average high air temperature in Oceanside in September is 71°F, and average low temperature is 56°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Oceanside

Changes water temperature in Oceanside in September 2025, 2024

To get an accurate forecast for the water temperature in Oceanside for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Oceanside, 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 172.9°F72.1°F65.8°F74.5°F
September 272°F72.3°F66.2°F74.8°F
September 371.2°F72.9°F65.7°F76.1°F
September 471.6°F73.2°F63.9°F75.7°F
September 571.1°F73.8°F63.1°F76.5°F
September 671.8°F74.1°F63°F77.2°F
September 7 74.5°F64°F76.6°F
September 8 74.7°F65.1°F76.3°F
September 9 75.2°F65.5°F75.2°F
September 10 74.3°F65.5°F75.6°F
September 11 74.1°F65.5°F75.9°F
September 12 74.7°F65.5°F76.3°F
September 13 73.9°F65.5°F76.3°F
September 14 72.9°F65.3°F76.3°F
September 15 72.5°F64°F75.7°F
Day 2025 2024 Min Max
September 16 72.1°F64.6°F75.2°F
September 17 72.1°F64.9°F74.8°F
September 18 71.2°F64.9°F74.8°F
September 19 70.7°F65.1°F75°F
September 20 70.2°F65.1°F75.4°F
September 21 70°F64.9°F75.2°F
September 22 69.4°F64.9°F74.8°F
September 23 69.1°F64.6°F74.8°F
September 24 68°F64.9°F75.2°F
September 25 68.9°F65.3°F75.4°F
September 26 66.7°F65.5°F75.4°F
September 27 65.5°F65.5°F75.7°F
September 28 64°F64°F75.6°F
September 29 63.5°F63.5°F75°F
September 30 64.4°F64.4°F74.7°F
Oceanside water temp chart in September

Average water temperature in Oceanside in September over a decade

20152016201720182019
75°F68.9°F70.5°F71.4°F72.9°F
20202021202220232024
70.7°F69.3°F72.3°F71.1°F71.1°F

Oceanside sea state in September

Chart comparing the height of waves in Oceanside 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 Oceanside in September

Weather and climate in Oceanside in September

This data display average monthly climate indicators in Oceanside 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 temperature71°F
  • Average LOW temperature56°F
  • Average rainfall8mm/0.3''

Oceanside 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

Best Beach Resorts in California in September

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

AvrMinMax
Santa Monica68.4°F62.6°F73.4°F
La Jolla Cove70°F63.7°F76.1°F
Lake Tahoe64.9°F59°F70.5°F
Los Angeles68.2°F61.5°F74.3°F
Encinitas70.2°F61.7°F77.4°F
Moonlight Beach70.2°F61.7°F77.9°F
Cardiff70.2°F61.7°F77.9°F
San Elijo State Beach70.2°F61.7°F77.9°F
Swami's Beach70.2°F61.7°F77.9°F

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Oceanside has a "Blue Flag" [1] award

Sandy beach

This place is suitable for families with children

Current rating: 4,5 (4 votes cast)

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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 Oceanside 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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