How far into the fall/winter is it warm enough to swim in the ocean at San Diego?

Hey,

My friends and I are trying to plan a trip, but can't go right away. Just wondering how late in the year it is still warm enough to swim in the ocean in San Diego.

Also, in case we can't do it by then, how early in the spring does it become warm enough? I wanted to go for my birthday once, but no one wanted to go cuz they said it would be too cold.

Please tell me when it is warm enough so I can tell them.

Thank you.

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