I don't think you can predict year to year or even week to week activity on any camino. The previous poster states 'the crowds drop off during September", however, I walked this past Sept 2018 and it was very very busy. There were a few days where alburgues, both municipal and private, were filled early in the afternoon and were turning pilgrims away. It was hot last year and I was starting my days' walk early in the dark mornings and finishing by 2:00pm...places were full. I was glad I had made reservations ahead as there seem to be fewer accommodations on his route. ( I was traveling with a tumor in my knee, so could not risk having to walk any extra on any given day ) The alburgue owners felt badly having to turn walkers away and said they had been seeing an increase in September. Staying flexible, grabbing a bed early to secure one or planning to walk much further ahead are options...as is taking a taxi to lodging then back to resume walking...good luck!