All moisture will, in time, damage the bike. If it is to be an outdoors bike, it will be worth it to get a bottle of lube, many brands work well, and hit the chain, pivot points on the brakes/shifters and a drop or two down the cable housings periodically.

And another nudge to lock it well. I had a cheap, beat up mountain bike locked with a cable lock stolen off my front porch in college. I went to a small school in a small town in the foothills of the Rockies. I would have never believed there would be crime there.