I've ridden in the rain a lot. I actually destroyed one of my favorite motorcycle helmets after one torrential downpour ride to work. And I've encountered rain enough times that I curse the heavens whenever I start feeling precipitation begin pelting my gear.
Now, there are loads of rain gear options available to you, as there are full rain suits to neat water-wicking helmets and boots. But none of them remove the experience of getting smacked by water droplets at 65mph. Nor are any of them fully waterproof, as rain seems to always find a way down your back and into your underroos.