Vegetable leaf issues

[Dtyz450]

Hi everyone. I'm a novice gardener coming across some issues with zucchini, cucumber and cantaloupe leaves in my garden. I've searched the web and can't really find any info as to why my leaves look like this. Any help is appreciated. Thank all

 

[Brandie]

Looks like sun scald to me. Maybe downy mildew...

 

[Beth_B]

Where do you live? That would be helpful to know.

Those leaves look OK to me in that pic actually.

 

[Dtyz450]

I live in northeast Ohio. Here's a few more pictures