If you’re going to get there early, say 10 in the morning, it’s still going to be gray and foggy and a bit breezy. The temperature will be close to 67° but with drizzle, it’s going to feel cool and damp. Wear layers.
By lunch time, it’s going to be comfortable. It’ll be mostly clear, but only in the low 70′s. The light winds will continue at about 7 miles per hour out of the Southwest.
Around six in the evening, it’s only going to drop a couple of degrees back into the 68° or 69° range, but the winds are going to be a little stronger and the sun is going to be setting, so by then you may want to put the sweatshirt and jeans back on.
Take a scarf because by 9 that night, you’ll want it and need it, especially if you grew up in Southern California. The reading will be in the low 60′s, 63° at best, still breezy with increasing clouds.
Hope that helps. Have a great time!