Yes, you can often have one ordered and called within 10-15 mins in Orange County.

Closest/Most Convenient: John Wayne Airport (Santa Ana) and Long Beach Airport Further Away (Can often find more direct flights to SD and LA): San Diego International and LAX - Los Angeles International Airport

California June weather is typically perfect weather, sometimes gloomy in the morning and sunny by afternoon. Some little drizzle can be common but not often. Pack light sweaters for mornings and evenings.

San Clemente, Dana Point, and San Juan Capistrano. Most of the festivities are going to be within these towns as this is where both families reside and where the wedding festivities will be taking place. Laguna Beach is a fantastic city as well, however the commute will be longer to the wedding festivities (Approx. 30-45 with Summer traffic ramping up).

Yes, this would be most convenient for long distance travelers, renting a car near airport is highly recommended as public transportation is tough to come by.