Covid really Impacted the beginning of the Norte route, closing all of the publicly-run Albergues in Basque Country. If you are starting past Bilbao, this will not be an issue. However, that route does run through prime beach vacation areas, so inexpensive non-pilgrim accommodations tend to fill up pretty quickly.
August in general is when many people return to the Camino (especially Spaniards) as the heat is starting to dissipate and summer vacations are drawing to a close. While Albergues are back to full capacity on most routes (including the Portuguese), you likely will find some of them “completo“ as you walk. Doesn’t mean you shouldn’t at that time, just that you might want to pre-book if you have specific places you want/need to stay or are limited in your ability to walk a little further to find a bed.