Check the manual under Caring for the Camera and I think you will find it mentions it is not waterproof and immersion in water or high humidity can cause problems.
I imagine getting caught in a sprinkle isn't going to hurt, but would still avoid getting anything wet.
When I hike or backpack or even while working, I carry enough Ziploc baggies and poly trash bags (size dependent on pack and bag size), so if caught unexpectedly, I can protect the gear for a prolonged deluge.