Weather.com has a neat tool that acts sort of like a Farmer's Almanac for the cities they provide weather forecasts. I didn't even think about looking at the weather for April! Then again, it is California, and there's a very good chance the weather will be nice.

Here are the typical temperatures for Rancho Palos Verdes, California:

And it looks like there's a pretty small chance of rain, but I've heard it's lucky to have rain on your wedding day: