Here's something intriguing to check out. Apparently, Google and Motorola did a great job with the "water resistance" on their Google Nexus 6. The above video gives a fairly remarkable demonstration of the device actually charging wirelessly underwater.
Since the Nexus 6 isn't actually IP certified, but is only "water resistant," this was a risky maneuver on the part of the owner. It's still intriguing to watch even though I wouldn't recommend it. At the very least, this lets us know that the device should be able to handle rain, or even an accidental dunking in a pool, sink or toilet.