By what mechanism?
Once the doors are closed as the aircraft is parked then is it not effected "sealed"? If so then the only moisture inside is that which was captured during its last flight?
I'm also puzzled by your statement "....will accumulate a lot of moisture inside, especially if the OAT is high/-ish " - if the OAT is high/ish then that will warm the fuselage and encourage moisture to remain gaseous rather than condense?
Or have I just got the physics wrong?