Just got back after Xmas here.8 out of 10 days were full sunshine to 19degrees.
Sagres seems low key, felt Portugese (at least low season) with probably enough to hold the laid back surfers attention.. There are excellent quality hotels such as Memmo Baleera and the Pousada and Martinhal, and very good value Time Apartments as well as many signs for rooms to let. Also camper vans which means good for travellers on a budget.. Its a good 30 minutes from Lagos (in a national Park) which I guess keeps it seperate.
For those over age 60 it reminded me somehow of the empty, Beautiful Sinai desert in the 1970's (down to Sharm) before Egypt took it over.