when is the pool water warm enough to go swimming?

All depends on how warm you like it...

I actually keep notes on this as we have a huge above ground pool. I don't know if you have a pool or are wondering about a public pool, but here is what I can tell you:

It must be HOT and SUNNY during the day to get the water up to 80 degrees, which is the coolest I can swim in. (Test this in a bathtub, but it won't really tell you like a poolful of water will.)

HOT means really hot days and NIGHTS that are no lower than upper 70s to low 80s.

If it rains a lot, that cools the water.

If it's hot out but cloudy, the pool won't be as warm. The direct rays beating down really heat the water.

Here in VA I wrote that we had an unseasonably cool year last year and the first 90 degree days started JUNE 6th. Eeeeek!

I hope this helps.

Certain pools always seem cold. Usually these are the ones that swim teams use to practice in. The water needs to be a bit colder for them so that they don't tear and hurt their muscles from over-heating. It's no fun for kids or people with low body fat, but necessary for the safety of the athletes.

For a normal pool, the temperature should be at or above 80 degrees, and usually get warmer when the sun is out. For a swim practice or meet the pool should be from 77-80 degrees.

it depends.

if you are doing laps, then it doens't really matter because you will get hot. So if you're doing that, I would prefer colder water so that the cold water feels good on you're face.

for just hanging out in a pool, depends on your preference.

68 to 70 degrees or higher. It really depends on your preference.