Surprised me yesterday (Sunday). Didn't feel nearly as humid during the day and while warm it was not the oppressive heat we've had this month so far. Anyway, right now (10:45PM) it's 74F under mostly clear skies with humidity at 85% and the dewpoint at 68. It's only going up to 76F today but with thunderstorms. By 4AM it's suppose to be a 30% chance going up to 90% chance by 8AM and 100% by 9AM. Then it'll start to fade back a bit but will still be at 70% at 10PM Tuesday evening. Sounds like I'll have to wait to mow the lawn. Doggone it.

Looked at the weather map and the rain is just now reaching the Mississippi river and judging from it's eastward speed, 4AM may be a pretty good guess.