Water & WeatherThe late summer and early fall months from August, September and October are invariably the best, while the late winter and spring (February to April) are the least predictable.
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The water temperature in the ocean in Los Angeles varies throughout the year, but generally, it is warm enough to swim from late spring to early fall. The warmest months are typically July, August, and September, when ocean temperatures can reach into the low 70s Fahrenheit (low 20s Celsius).
But on that same beach, it's not uncommon to see kids shivering as they run out of the water, or a surfer wearing a partial wetsuit as they jog out for a session. California's ocean water is pretty cold, even in the summer, and it often catches visitors off-guard.