I know it haves been very hot lately 103 yesterday my water was 89F. I happened to see I had lost a small amount of water so I did a test. I got a 5 gal bucket and marked the water line half way up and set it by my pool also marked the water line on the pool with the pump off. I have my pump on a timer it runs from 10 am-2 pm off from 2 pm-6pm on from 6pm-10pm off the rest of the night until 10am the next day. Over the day the bucket lost about 1/8 inch of water the pool had no visible loss. I got up today and the pool level had dropped over night about 1/8-1/4 inch. Why would my pool only lose water at night. Its an above ground pool so I can see all plumbing pipes they have no leaks. Thanks for any help given!