What temperature is comfortable to go to the beach?
There's no real optimal temperature, but many people feel “comfortable” swimming in water that is 70° to 78° Fahrenheit.
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It's more of a question of preference. A little cooler than your body temperature (98.6° Fahrenheit) should not be too cold so that you don't get chilled. 70° to 78° Fahrenheit is the range where most folks feel comfortable swimming.
A basic t-shirt and shorts make the perfect combination for beach weather forecasts in the 70s. On sunny days, go with a short-sleeve tee, sailboat-ready polo shirt, or a loose tank dress.
What's warm enough for you and what's warm enough for me may not be the same thing. But generally people will start going in for a swim when the water temperature warms up to around 70 degrees Fahrenheit. At 75 degrees, most people will venture in and at 80, anyone will swim comfortably.