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Why would the water in a swimming pool or lake feel warm when the air outside is cool?

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Water molecules and heat It takes longer to heat or cool water than for air. The water was probably warm from being heated by the sun all day, and so was the air. But in the evening or when there is a cloud cover, the air cools more rapidly than the water, hence the observed difference and conflict. Likewise, water that sits in the cold all night long (or for several days) stays cold for a long time, even during the first few hot days where the air is warm.
ADDITIONAL NOTE ABOUT POOLS When you jump out of a swimming pool, the water molecules on the surface of your body escape with whatever body heat you had while in the pool. Water is an excellent conductor of heat (as opposed to an insulator) so it steals heat from your body. So you feel colder out of the pool right after you come out.
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What is the ideal swimming pool temperature if you have 30-34 Celsius outside air temperature?

30C-34C is about 86F-93F! That temp will generally feel too warm for most people in a pool. A better temp that would suit more people would be around 27C-29C or 80F-84F. T

Why is it when it's raining the water in the swimming pool is warm but when it is sunny the water in the swimming pool is cold?

It's all about how your body reacts to relative temperatures. The truth is that the pool temperature is not likely to be the culprit. It's more about how your body perceives t

What would cause you to be sick after swimming in a salt water pool?

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What would cause the water in a swimming pool to be blue not clear?

You need to add chlorine. I doubt in the above answer that chlorine will clear up a "blue water" situation. BTW, is the water or the pool surface - floor, walls etc - blue - t

Why is your air conditioner blowing cool air outside instead of warm air?

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How warm should swimming pool water be for a baby?

General info on pool temps: Most people are comfortable in pool water at about 80F on the low end. Almost everyone is comfortable at 85F. Some people will find a 90F pool sta