Late october you can die of hypothermia or heat exhaustion. Best to rely on previous experiences, if it is a first Grad VI or equivilant I wouldn't do it personally. Days are short, weather can come in fast, you are wayyy out there... but can be great weather if the cards are right.
Go fast. And check the WX at the Mountain Shop right before you go.
October weather can be hot, or can be snowy.
Late autumn Big Walls is all about the weather. Faster is better. The weather prediction in Yosemite is OK, but not great. Usually, though, a long-term storm is knowable beforehand. One, maybe two days of thunderstorm delay, not so much.
Play late October Yosemite the way they do it all the time in the Alps: run like crazy, and hope for the best.
It'll be cold, cold, cold up there at night, even after a warm day.
Go there, but don't have your heart set on anything. It will either be fine or it won't be...don't confuse the two because you want to send. Also the weather forecasts tend to change from day to day so check it right before you go. Have fun YER GONNA DIE though
One thing I've noticed is that clouds seem to come more from the southwest when in the valley. I might be full of it, but that's what my eyes tell me. So when you're on that face, you can suddenly get surprised when you thought you had clear skies.
So just plan for enough clothing/insulation to not die in cold rain or sleet, and you probably won't need it.
It's California, just bring a tank top and sunscreen!
In reality, there is some unpredictability in day to day weather, but big systems don't usually come out of nowhere around here. Check the weather and it won't be that far off, you're probably not gonna get "Alaska'd" or anything.