Water temperature in San Clemente Island (CA) in December

Is it warm enough to swim in San Clemente Island in December? Average water temperature in San Clemente Island in December is 61°F and therefore is not suitable for comfortable swimming. The warmest sea in San Clemente Island in December is 66.4°F, and the coldest is 56.8°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in San Clemente Island

Changes water temperature in San Clemente Island in December 2025, 2024

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

Average water temperature in San Clemente Island in December over a decade

Chart comparing the height of waves in San Clemente Island 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.

You can also view information about water temperature for other months by clicking on the month button below

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

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Our report for San Clemente Island 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.