This. Seriously. You bought a piece of outdoor equipment and you're afraid to take it outside? (I know, I used to live in Santa Monica, and a quarter inch of rain paralyzed the whole southland...).
Bikes' vital parts are pretty well protected from rain. I would cover a leather saddle, like a Brooks, if you have one, and after the ride, bounce the bike to shake off water, then lube the chain and pivot points on the brakes and derailleurs. But it's in no sense a threat to the bike.
Do watch out for oily spots on the pavement, though. You don't get much rain down there, and the first storm floats up all the crud on the road.