The San Francisco Chronicle states, “Our beloved bay isn't known as a swimmer's destination.” However, the Bay Area offers many places to swim in the open water. Areas to swim include: Keller Beach, Richmond. Berkeley Marina, Berkeley.
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It's never safe to swim at Ocean Beach and even wading is dangerous. Unpredictable tides and rip currents (strong, swift-moving channels of water) can pull swimmers offshore. If you're caught in a rip current, swim parallel to the beach until you're free of it, then swim toward shore with incoming waves.
San Francisco is surrounded by water, but the area isn't known for warm beaches where you can soak in the sun all summer long. But there are still pockets of sandy coves and coastal areas where you can find warm beaches near San Francisco.
What makes the water appear green are lots of microscopic marine algae called phytoplankton. These photosynthetic organisms contain the same chlorophyll that makes plants green. Though they're tiny, phytoplankton represent the largest biomass in the bay.