Yes, it goes without saying (but I'll say it anyway) that Missouri and Illinois will be dark for about 4 minutes during the historic April 8 total solar eclipse, but how dark will each state be? Answer - all of it.
We know for a fact there will be a historic total solar eclipse that will cross Missouri and Illinois during the afternoon on April 8, 2024. What we don't know for sure is whether it will be cloudy or sunny. There is now an official forecast from meteorologists about what they think will happen though.
I didn't believe it when I first heard it and still don't understand exactly what's happened, but the total solar eclipse path over southern Illinois on April 8 really has changed and been confirmed through several reputable sources.