If they are unprotected, make sure they are pointing down. That should be in the user instructions.
But really the simplest thing is just to get an enclosure box:
Your local Home Depot should have several to choose from.
If you get a double gang enclosure, it should be large enough for two of the outdoor switches.
Avoid metal enclosures and blue plastic enclosures. For whatever reasons, the blue plastic frequently interferes with signal more than clear or gray.