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.
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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.
Lanikai Beach, Oahu, HawaiiBut few compare to Lanikai (which translates to “Heavenly Ocean”) Beach on the windward coast of Oahu. It's ranked as one of the most beautiful beaches in the United States and has some of the warmest water, ranging from 77 to 82 degrees.
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.