It's been cooling off in the evenings here, too, we've had highs in the mid 80's but it gets down to the 50's overnight, and we've had the back door open most evenings, unless someone in the neighborhood has a fireplace going, in which case the wood smoke smell is too strong for us.
My wife sent me a USDA alert earlier this week about cool weather trends that may affect harvests in the
upper midwest the next week or two. There could even be freeze warnings next week.