Colder water sinks below the warm water at the surface which contributes to the coldness of the deep ocean. This results in less warming of the water.

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Therefore the deep ocean below about 200 meters depth is cold with an average temperature of only 4C 39F.
Why does ocean temperature change little from day to night. Why does ocean temperature change little from day to night. Cold water is also more dense and as a result heavier than warm water. Marine ice caps keep ocean water from heating up t0o much.
Salts in ocean water absorb sunlight during the day and release it at night. Lesser cloudiness over the oceans allows them to soak up more solar energy than land.

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