Mine got a thorough soaking in seawater - I was doing long exposure stuff on some rocks when a rogue wave washed over. At one point the entire camera was beneath the foamy stuff. Gave it a good scrub with a wet/damp cloth and toothbrush when I got home and it has been fine since - and that was with a non-weather sealed lens on it (Samyang 12mm). I've also used my 18-55mm very briefly in a torrential downpour (see photo). Granted, it was literally poked out from under the cover for a few seconds a couple of times, but it got very wet. I dried it off, and never had a problem with it.
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I'm kinda between two ideas with it - I don't think weather sealing does as much as manufacturers would have you believe, but I also think you can get away with more than you'd think - In a similar way to my phone or laptop not being weather sealed. They would probably be fine in a light shower (in fact I regularly have to wipe rain off of my phone screen), and even if water does penetrate, removing the battery and drying them out would likely revive them.