How much does the ocean temperature change from day to night?
Ocean temperature also doesn't vary much over a 24 hour period, less than 1 degree. So for those yet to experience a night-swim, because actual air temperature can drop, but the sea stays the same, the water may feel warmer at night.
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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.
Hot Water Beach in the Coromandel in New Zealand has hot water that reaches up to 64 degrees C. It's not the water in the sea, however, but the water that bubbles up through the sand from the geothermal springs.
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.