What Herdbull said...
I wipe the bow down before I put it in the case, but I don't disassemble.
I don't leave it in the case after it gets wet, though...it air-dries in the house.
The only time I'm concerned is if a really hard rain freezes quickly...which can expand water trapped under the limb. Most likely, that expansion would push the water/ice out the way it came--thru the side openings--but if your pin/bolt aren't waxed, it can work its way in there, or into the surrounding wood area.
Then I'd think about taking it apart...
Take Care,
Marc