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Water retains heat longer than the air does.

As a result, at night when the temperature drops the pool is fairly close to the temperature it was during the day while the air around it can become significantly colder.

The same effect occurs with the ocean where the warmest ocean temperature on the eastern US are in September when the relative air around it is much colder.

Pools seem warmer at night because the air outside (ambient air) is normally cooler. The temperature of the pool at the end of the day is when its the warmest and it cools down overnight. So ususually by morning the water is not as warm as it was when you get in earlier during the night.

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13y ago

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