We have suffered through a really bad no rain/snow year here in SoCal. Most of the local streams are running very low. Check with Steve, Ken, Dave or Dean at the "Spot" for further information. If you are interested in FF the surf, Dean is the man.
Here are some of the local streams:
California Fly Fishing Information | Pasadena Fly Fishing Hot Spots
If you have a full day available, consider a run up to the Kern River above Kernville, CA. Check the Kern River Forum for current information and give Guy Jean's Shop a call. There are some very large rainbows in that river and it is the closest large, running cold water to LA...