I must have been in denial about the heat around here because I've had this pool for weeks and it has been in the 90s for weeks but I only decided to inflate it and fill it today. Should have done it this morning so the water would have a chance to warm up with the sun though because Henry was not pleased with the cool water when I plopped him in there! Tomorrow I'll plan ahead a bit more. Sorry, little Henry! (The girls didn't care one bit though!) I have to note that last year I bought a pool in Korea that was smaller for $40 and this pool was $5. Next time we go overseas I'll have to stock up on baby pools!