San Diego hosts over 30,000 weddings a year for a good reason. It is usually sunny and gorgeous. But it can get quite hot here, especially inland, and contrary to popular songs, it does rain here.
Outdoor events must have adequate shade for guests, children, older folks and bridal party. Consider water, lemonade or iced tea for guests who will arrive early and parasols, fans, rented market umbrellas or tenting to provide reduced temperature and UV protection. No one likes to sweat in formalwear and full makeup - not you, your guests or your wedding professionals for that matter.
Also be sure to keep an eye on children and the elderly who may be especially susceptible to warm temperatures on such an exciting day! Keep them shaded and hydrated with healthy beverages. And as for guests remember alcoholic drinks may seem refreshing but actually end up causing dehydration so have plenty of water stations available.