Pool time!

So it has been in the 90's for the last week and today Noah and I thought we would check out our pool. The weather was 93 degrees and 85 percent humidity. A dip sounded GREAT! Pools that are not heated should not exist! It was FREEZING! After a few seconds you could get use to it but it was more of a dip then lay in the sun and then dip again kind of pool. Do cold pools ever get warm on their own? What does it take for it to get warmer? Needless to say Noah and I had a great time and Noah's farmer tan is sooo cute (he tans through the 50+ sun screen)