Hi I left SJPDP on the 27th October and arrived in SDC on the 27 November. What has been said that the weather can be varied is the one thing i would support. I went over the Pyrnees on hot sunny day, walked across the mesata in strong stormy winds,when we could take shelter we did. Walked up to O Ceiberio in a snow blizzard, then 3 days later was laid in a field taking in the suns rays on a hot winter day.Take clothes that can cover all the bases, you may find it hard to get them dry,so take clothes that you do not mind wearing a few times before you get round to washing and cleaning. Dry bags are not essential, a good raincover for your backpack will keep it dry.
Albergues start to close from the end of September onwards, but there is enough open even in November for it not to be a problem. I only came unstuck once, i had planned to only walk 20km but found that the intended albergue was closed and had to walk 30km. I never really stayed in a busy one and in Sarria i was the only person in the albergue Casa peltre.
Take walking in late October as a blessing I felt it that way and the people i met did.
Buen Camino