@verar, are you already in SJPP or still on your way?
We've got the odd situation at the moment where the weather in the Netherlands is better than in Spain. You will move from stable sunny late summer weather to cooler rainy and not very stable weather that is more difficult to predict. The Meteoblue forecast for tomorrow (Friday) is still only medium (2 "dots" out of 4) which means "
accurate in parts but deviations are expected. Check again for latest updates." Thunderstorm icons are hovering around but there are no Aemet severe weather warnings for the area SJPP to Roncesvalles. The hourly forecast appears to indicate that thunderstorms / rain are more likely in the afternoon if at all ...
You've booked a night at Orisson. Which would mean that you could do most of your walking in the first part of the day on both Friday and Saturday. This is
not any kind of advice from my side, though ... In SJPP, you could ask at the tourist office or at the pilgrim office for opinions and also at Orisson - Jean-Jacques is the name of the owner.
Buen Camino and let us know how it worked out for you!
Here is the current view from the nearest webcam:
View attachment 177807