I have often wondered whether "weather sealed" is just a marketing gimmick. I have used my D5000 in light rain before...definitely enough to get the camera wet although not soaking wet...with no problems whatsoever. I also got hit right at the end of the tour while looking at the pyramid on vacation - very light though...had to quitshooting because of raindrops on mylens. Supposedly no weather sealing on the 5000.
I'm thinking put a UV filter and an ass gasket on your lens and go shooting in the rain you'll be safe! LOL
I should mention that only Nikon lenses with a gold band on the front are fully weather sealed and actually advertise that they are meant to be beaten around and shot in the elements with. Though, I think that things are made so well these days that I doubt if you're remotely careful you shouldn't have problems.
I trick I learned years ago - I have a shower cap in my bag ( free from when you stay in a hotel)for that exact reason they work really well.