CupOfTea, if you see a good price now, I would recommend booking. Although August/early September may not be the height of travel for US tourists (bc of the school year calendar), it’s probably still a higher priced season where you may not see much in terms of drops.
From a personal perspective, I made about a $1000 mistake by waiting to buy three tickets to the UK from DC last year. Started watching the prices in October 2022 for a late June 2023 trip. They were really reasonable, but naive (I’ll give myself grace and not say dumb) me thought it was too early, travel articles I read said they would be lower later, etc. and I waited till after Christmas to look again… they had jumped by a lot. Never went down again. As Julia Roberts once said in Pretty Woman, “Big mistake. Big. Huge”. Ugh.
Anyway, I learned a good lesson about international airfare tickets. If I have a trip planned out pretty far, I’m not putting off buying them if I see a good price.
One last suggestion. If you go on google flights, punch in your airports and the dates you want to go. There is a historical feature on there that you can see when the best/ lowest prices were for the last year. I learned about it recently and it is a great tool.