October the water will be just bearable. Loads of good waves along that part of the coast - Lagos is a good place to base yourself with family and safe water options for kids - you can just go for a drive every day. Also a very good place for a beer without the ladies
October is probably my fav month to get waves in Europe with the water still warm and the first of the real winter swells to start arriving. Basically anywhere from the Bay of Biscay down to Portugal will be prime time. If you want warmer water perhaps head over to the Canaries - lots of options - and can be very cheap. A few localised waves over that way but in October you are out of the main summer season so you will have a ball. My fav spot at that time of year is either Hossegor in France or Anchor Point in Morrcoo - a bit further to fly but a great place. A bit busier these days but there are loads of high quality waves around. Enjoy.