Hi, Richard,
Welcome to the forum! I walked the Primitivo at the end of October one year and had a little rain, some cold, lots of sun, and just generally pleasant weather. There's no telling what you'll get this year, but I don't think you have to worry about winter-like conditions and with good luck the rain will hold off as well. You'll be going earlier than I did, but one thing that shocked me was how late daylight came. I remember walking out of towns at 8 am and it was pretty dark!
Buen camino, Laurie