I can't even remember seeing Yosemite Falls in October with no water flowing?
It was very dry and bright and the Falls were at a trickle when we visited in late October 2007, but it was cold enough to freeze the pass overnight and cause temporary closures. It eventually closed for the season on the 6th December that year.

It could well be a late closure, but we know how quickly things can change in the Sierra's.

Dave