If you are going so soon and will be sleeping in albergues, I would definitely take a light sleeping bag. Mine weighs 600g and my silk liner about 200g and even though the sleeping bag is a bit heavier that extra warmth does make a difference. I walked from Tui/Valenca some years ago and was freezing because the albergues were large, made of stone, not heated and had hardly no other pilgrims in them to help heat the place up. In Mos I didn't sleep all night because I was cold - but then I sleep cold. If you don't, I suppose wearing wool long johns and a top, socks, hat, liner and a few blankets (since there will probably be some spare) might work. Look online to find the temps there at the moment, compare with the ones where you are, try to sleep in a liner with the window open or something. You'll soon find out. Good luck whatever you decide!