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Water temperature in San Onofre Beach (CA) in December

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Is it warm enough to swim in San Onofre Beach in December? Average water temperature in San Onofre Beach in December is 60.8°F and therefore is not suitable for comfortable swimming. The warmest sea in San Onofre Beach in December is 65.7°F, and the coldest is 57.2°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in San Onofre Beach

Changes water temperature in San Onofre Beach in December 2025, 2024

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

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
December 163.5°F59.2°F57.7°F65.5°F
December 263.9°F58.5°F57.7°F65.5°F
December 363.9°F59.4°F57.9°F65.3°F
December 463.7°F59.7°F57.9°F65.3°F
December 563.5°F59.5°F57.9°F65.1°F
December 663.3°F59.4°F58.1°F65.3°F
December 763.1°F59°F57.4°F65.3°F
December 863.3°F58.6°F57.6°F65.3°F
December 963.5°F58.5°F57.6°F65.7°F
December 1063.1°F58.1°F57.6°F65.7°F
December 1163.3°F58.1°F57.7°F65.3°F
December 1263.5°F58.1°F57.7°F65.1°F
December 1363°F58.1°F58.1°F65.1°F
December 1462.8°F58.6°F58.5°F64.6°F
December 1562.4°F58.5°F58.5°F64.2°F
Day 2025 2024 Min Max
December 1662.2°F58.1°F58.1°F64.4°F
December 1762.2°F58.1°F58.1°F64.2°F
December 18 59°F58.5°F64.2°F
December 19 59.2°F58.5°F64.2°F
December 20 59.2°F58.6°F64°F
December 21 58.5°F58.3°F63.9°F
December 22 57.9°F57.9°F64°F
December 23 57.9°F57.7°F64.2°F
December 24 58.5°F58.1°F64°F
December 25 59°F57.6°F63.7°F
December 26 58.8°F57.6°F63.7°F
December 27 58.5°F57.6°F63.3°F
December 28 58.5°F57.4°F63.1°F
December 29 58.3°F57.4°F63°F
December 30 57.9°F57.2°F62.8°F
December 31 57.9°F57.4°F62.2°F
San Onofre Beach water temp chart in December

Average water temperature in San Onofre Beach in December over a decade

20152016201720182019
63.7°F60.8°F62.8°F62.4°F61.3°F
20202021202220232024
60.4°F60.6°F59.5°F62.4°F58.6°F

San Onofre Beach sea state in December

Chart comparing the height of waves in San Onofre Beach in December 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 Onofre Beach in December

San Onofre Beach 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 December?

Want to know where the water temperature in December 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 December

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

AvrMinMax
Santa Monica60.3°F55.6°F65.5°F
La Jolla Cove60.8°F56.3°F65.5°F
Lake Tahoe46.4°F42.3°F52.7°F
Los Angeles60.1°F55.2°F65.1°F
Trestles Beach60.8°F57.2°F65.7°F
T-Street Beach61°F57.4°F65.5°F
Baby Beach61°F57.4°F65.5°F
Capistrano Beach61°F57.4°F65.5°F
Doheny Beach61°F57.4°F65.5°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 Onofre Beach 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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