Swimming in California in september 2025 Sea temperature by city in september

In september in California swimming conditions vary by city. Details below:

Swimming in september in Los Angeles , San Diego, Encinitas, Hollywood, Malibu, Manhattan Beach, Newport Beach, Oceanside, Oxnard, San Clemente, Santa Monica, Topanga, Ventura, Carlsbad, Chula Vista and Huntington Beach is possible but the sea is generally cool. So though the sea temperature may sometimes reach 70°F, it can also go as low as 64°F. Note that the average is 67°F.

Swimming in september in Channel Islands National Park, Gaviota and Santa Barbara is possible... with a wetsuit! Indeed, the water is cold at this time of year with an average temperature of 62°F (min: 58°F/max: 65°F).

Forget about swimming in San Francisco, Big Sur, Cambria, Carmel-by-the-Sea, Crescent City, Eureka, Golden Gate National Recreation Area, Gualala, Half Moon Bay, Jenner, Klamath, McKinleyville, Mendocino, Morro Bay, Moss Beach, Oakland, Pacific Grove, Pescadero, Pismo Beach, Point Reyes, Santa Cruz California, Sea Ranch, Stinson Beach, Timber Cove, Bodega Bay and Fort Bragg in september! The water temperature is freezing, reaching as low as 56°F (and only 59°F at the best of times). Our advice: plan on sightseeing, and don't bring your beach towel!