Heat related? Water related? Thoughts?

[Kopper1013]

So 3 of 4 plants have these holes, most all are on younger leaves and it appears that it’s happening as they open up?
Wondering what your thoughts are? Not enough water? Getting to dry?
Heat? Something else?

They all seem to be in the same region on the leaf’s themselves like first third of the leaf but not right at the stem…

 

[mysticepipedon]

I think you have more than one thing going on here. That first pic and some of the others look like thrips. But I welcome other opinions. You'd need to scope it.

 

[MIGrampaUSA]

That makes 2 on a potential pest issue.

It looks to me like something is eating your plants. Look at both sides of the leaf with magnification. I'm not 100% certain from your pictures, but it looks like your grow is outdoors.