Looking at the zoomed in maps for the Chicago area, it's actually more like a 10 degree difference in the highs between Chicago and the areas well inland. Not making a call on high temps yet, but I am confident there won't be that large of a spread in highs. No way.
Something seems off with those maps, and it's the large discrepancy between Cook county and the rural/well inland areas of northern IL. You'd expect it to be warmer in the urban area, but a 6-8 degree difference during the afternoon seems a little egregious. So I think it will be warmer inland than shown, cooler around Chicago than shown, or some combination of that.
You come in with your daily lesson like you’re providing everyone with new information. And then in a couple hours you’ll hit us with a 16 day GFS temperature output showing your backyard hitting 110F.