Thanks for the tips everyone. The rain actually held off and it ended up being a great ride. It drizzled a few times but nothing too bad. I did notice my glasses getting fogged up at stops too the few times it was drizzling.

It was my first metric century and I completed it feeling great. (I am so glad it didn't pour rain too. I can't wait for my first century ride now! It ended up being 66 miles.