Riding a road bike in the rain isn't a big deal. Take it easy around corners and don't expect to be able to stop on a dime. My rear brake is next to useless on a wet surface but other than that the bike performs pretty well in the rain.

Wet metal surfaces require extra care when being ridden on. Wet leaves are almost as bad as ice but usually not much of a problem until fall. Compared to winter riding on ice and snow, rain is a piece of cake.