I had a waterproof speaker once, made to be used in the shower. I would only listen to morning radio while getting ready, so it saw real light duty. But even with that, I realized pretty quickly that these are just water resistant - not waterproof - and will die a wet death in short order. Even a plastic enclosure containing a driver with a polypropylene cone isn't happy in the humidity of a shower.
So I'm with Bill on this one. Forget the waterproof speakers, and leave the radio dry, on the shelf. Just turn it up a little bit more.
I was afraid that these speakers were really only water resistant. It seemed that actually making them waterproof would be too good to be true.
I'll stick with the advice from you and Bill, and leave everything outside.