The best time is when the tide has been low in the morning, and the incoming afternoon tide flows over the hot sands. If the timing is right, early evening with the tide now high and the sun setting over calm warm waters is hard to beat.
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Sand has much lower specific heat than water. A low specific heat means sand doesn't need much energy from the sun to warm. That's why when the sun comes out in the middle of the day, sand goes from comfortable to hot quickly. At night, when the sun goes down, the sand cools also very quickly.
Air also has a lower Specific Heat Capacity compared to water. Ocean temperatures don't cool at night, nor do they warm during the day. When the sun goes down, air temperatures cool. When the sun rises, air temperatures warm.
Unless there is a frontal passage or squall line blowing through, early to midmorning tends to be calmer than later in the day. The winds tend to die down overnight, and since winds generate waves, the waves tend to lay down.
Daytime is the safest time for ocean swimming. Visibility is low in early morning hours and at dusk, and predatory animals in the water tend to move closer to shore at night. What to do during severe weather. If you see an approaching storm, it's best to get out of the water until the storm subsides.
Not much heat moves into the lower levels of the ground. The heat that the ocean absorbs is mixed with the lower water quickly. That mixing spreads the heat around. At night, while the land cools off quickly, the water at the surface is kept warmer because the water is mixed around with the warmer water underneath.
The sea level rises at night because of the influence of the moon's gravity. While it is not strictly tied to the day-night cycle, the moon's pull changes the distribution of water on Earth, most obviously in our oceans, where tides can rise and fall by several feet at a time.
It depends on where you are. On the pacific coast of the US the ocean water is cold because it flows south from the gulf of Alaska. On the east coast the currents bring water from the south and it is comfortably warm from Florida to Maryland in the summer.
Go early—or go late.late morning, ending with early lunch at the beach, or head there postnap for late-afternoon seaside bonding. The point is, avoid spending a huge chunk of time at the beach in the middle of the day, when UV rays are strongest.