Sprinkler Kids

Is there anyway to heat up a child size pool?

I live in the desert and it gets hot. So I usually get a child size pool for the summer for the kids. Problem is, everytime I fill it up the water is ice cold. Is there anyway to heat the pool up? My sis tried putting some hot water in hers one time but that trick didn’t work.

I usually fill the pool the day before we want to go swimming. It warms up nicely, but it’s hard to keep the kids out of it until you’re ready for them to swim.

Sprinkler Kids