Zach, I'm probably just a bit south of you. I'm in a Kansas suburb of KC. I have been dealing with a bit of Early Blight and what I believe is Septoria. If it were me, I would remove all leaves up to the first flowers/fruit and dispose any leaves that have any yellowing or brown spots.
As you said, our weather went from miserably humid (110 heat index) to rain and now we are getting some beautiful weather with unusually cool nights. The purple might be weather related, but I have never seen that kind of purpling. I agree with the advice to take it into an extension office. There is one in Olathe if you are on the KS side. Hopefully it is just a mineral deficiency and a good fertilizer will fix it. I use Texas Tomato Food but had to order it. Tomato Tone should work too. Please keep us posted on how it is going. If it is any kind of fungal disease, my garden will catch it.
Bret
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