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Water temperature in Rio Del Mar (CA) in September

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Is it warm enough to swim in Rio Del Mar in September? Average water temperature in Rio Del Mar in September is 59.5°F and therefore is not suitable for comfortable swimming. The warmest sea in Rio Del Mar in September is 64.8°F, and the coldest is 55.2°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Rio Del Mar

Changes water temperature in Rio Del Mar in September 2025, 2024

To get an accurate forecast for the water temperature in Rio Del Mar for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Rio Del Mar, 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 163.3°F61°F55.2°F64.4°F
September 262.6°F60.4°F55.8°F63.5°F
September 361.3°F61.3°F55.8°F62.4°F
September 461.5°F62.4°F55.8°F62.4°F
September 5 62.6°F55.6°F62.6°F
September 6 61.3°F55.8°F62.6°F
September 7 61.7°F56.1°F64.8°F
September 8 61.2°F55.9°F64°F
September 9 61.3°F55.2°F64.2°F
September 10 61.3°F55.2°F63.7°F
September 11 62.4°F55.4°F63.1°F
September 12 62.1°F55.9°F63.7°F
September 13 61°F56.7°F63°F
September 14 61.2°F56.5°F63.1°F
September 15 60.6°F56.5°F62.8°F
Day 2025 2024 Min Max
September 16 59°F56.7°F62.2°F
September 17 59.4°F56.8°F62.2°F
September 18 60.3°F56.1°F62.2°F
September 19 60.3°F55.9°F62.6°F
September 20 60.3°F56.1°F62.8°F
September 21 60.6°F56.3°F63.1°F
September 22 60.4°F56.3°F63.3°F
September 23 61.2°F56.5°F63.3°F
September 24 61°F56.8°F63.7°F
September 25 61.3°F57°F63.7°F
September 26 61.5°F56.1°F63.7°F
September 27 61.3°F55.9°F63.1°F
September 28 61.2°F55.6°F62.8°F
September 29 60.4°F56.1°F62.8°F
September 30 60.8°F56.1°F61.9°F
Rio Del Mar water temp chart in September

Average water temperature in Rio Del Mar in September over a decade

20152016201720182019
61°F57.9°F61.2°F58.6°F60.6°F
20202021202220232024
59.5°F61.9°F61.7°F62.1°F61°F

Rio Del Mar sea state in September

Chart comparing the height of waves in Rio Del Mar 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 Rio Del Mar in September

Rio Del Mar 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
San Diego69.1°F63.1°F75.6°F
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
Seacliff59.5°F55.2°F64.8°F
Pleasure Point59.4°F55.2°F63.9°F
Aptos59.4°F55.2°F63.7°F
Twin Lakes59.2°F55.2°F65.1°F
Seabright Beach59°F55°F63.9°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 Rio Del Mar 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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