Second out on BA trail. Bring a good headlight (or two) in case it is so hot that you need to wait until it is later afternoon and possibly dark. Maybe a GPS so you don't lose your way also. Better to wait until it is cool than to get sick. Maybe be prepared to bivy? Shit it's hot there, even in October I was there once and it was 100. How about a small light travel umbrella you could use to make your own shade? It's a long ways up.
I am a river, babe - I've got plenty of time, I don't know where I'm going, I'm just following the lines..... - "We are water" by Shaye