I have never in 35 years needed rain gear that late in the season. It's too cold then, if there's precip it will be snow.
Personally I wouldn't back pack in that late without a heat source.......would be miserable without one. I'd also rethink the 19 degree bag. I use a 0 degree quilt in Aug/Sept. November I'm up to my -30 bag.
“Better bring a ferro rod”This guy hunted two years then sold all of his gear because of your terrible recommendations.