Id echo what other s have had. I have done three crossing of Biscay , ( all south going) in November, one quite late.
The trip from Poland will be no piece of cake though, You need time and you have the advantage of plenty of harbours and good weather forecasting.
With Biscay, at that time, 3-4 day weather windows are a myth and something always build off Finnisterre and wacks you . Ive always got wacked in November and one of them was a big wack
I agree with Boatie on Coruna, dont like it at all in a big blow, Ive used Gijon commercial
port in real emergencies as the fairway to the marina is too shallow in big wave trains. ( The commercial
port police do get real uptight though!). Note this was where I started from Brest, Other wise banana way out to the west and stay well well offshore
, depart from Killmore Quay ,Ireland is better then Falmouth IMHO,
I would suggest a single
straight run from Ireland
to the Canaries
with Maderia as a interesting diversion. Leave Ireland right after the warm front of a low goes and catch the NWs, then a period of calm, hopefully you can get south before anything really nasty boils in ( again) . ( 8-10 day trip)
Be aware that in strong onshore blows the whole atlantic coats of spain
can be inaccessible.
You must be confident of handling the vessel in heavy weather and be happy she's up for it and all the systems etc are in good nick, You WILL meet a gale or several.
The trouble with a mid Oct depart is that with a few delays most likely due to weather and you could be very late entering biscay and or a transit of Portuguese coasts. Its a classic delivery skipper
type of trip. ie pay someone else to get beat up.
Given time I would stage the boat so as to be in southern portugal by end of Aug/early Sept. Then run to the canaries and accross in Nov.Dec.
Can be done , be careful, dont push it.