We went in October 05 and October 07 and it was humid, but not like Summer humid, and I believe it was still in the 80's. I love going in October because we celebrate our Anniversary there and MNSSHP and F&W Festival are going on at the same time.
The crowds were larger this past October compared to October 05, but very managable.
One of these days I'd like to go when all the Xmas decorations are up, but we never seem to get there at that time of year.