Depends on the type of grass you have. Kentucky blue grass will just go dormant and then bounce back with rain and somewhat cooler temps. With fescue and perennial rye grass you could actually lose some if it stays dry long enough and hot enough. I dont know what you type you have, but I think most will bounce back. Now, if somehow July is a roaster and dry, then obviously higher likelihood of some grass not coming back. But I mean you would need almost no rain for another 3-4 weeks I think to lose amounts you would notice.