I will be driving to Portugal it will take me a couple of days without bashing my brains out , the weather will be much much better and really warm so yes well worth it, Portugal is the warmest that I and others have found in January through.
Northern Spanish coast can be good or can be very wet, as the weather is very english like, from the Portuguese Spanish border at Tui and Vigo it will be good then if you drive the coastal motorway up via La Coruńa and along through Asturias it can be wet then up near to San Sebastian good weather, we were there last year on the way up-from Portugal and it was beautiful warm sunny weather, which ran all up through to Brittany.
But can’t guarantee it, hopefully it will be as I’ll be down at Alfor Portugal in January then Galicia in March.