I checked MeteoBlue for the Bentarte pass (Route Napoleon) today and yesterday.
There are currently "moderate flood warnings" issued by Meteo France. You click on the links provided to inform yourself more accurately and you end up on a map issued by Vigilance France that shows you the rivers in the region Pyrénées Atlantiques that are under observance. Then you make up your mind whether this concerns your walk and whether you have to take any precautions or just be careful and pay attention to further official warnings.
When I checked yesterday there was also a warning for severe rain. That means that a lot of water falls on the ground in a short time. It can cause landslides up on the hill. A video shows the very recent effect on the Camino that goes to the Somport pass which is nearby. See for example videos in the link posted by
@Bradypus or in this
recent post in another thread. Part of the road that you planned to walk on has disappeared and there is a huge gaping hole. Good thing that you were not on the road or beneath it on the hill when it happened.
No warnings for flooding or severe rainfall have been currently issued by the Spanish AEMET weather service for the southern side of the Pyrenees. However, there have been cases of heavy rainfall in the past where one forum member fell into the icy waters of a creek because he did not see that there was no ground under his foot; he considers himself lucky that other pilgrims were present who pulled him out. Heavy rainfall in the hills turns empty narrow river beds into fast flowing much broader streams of cold water that can cover part of the Camino path.
Reading and understanding weather forecast for the area where one wants to walk is a useful skill.