Our flight out to San Francisco was delayed Monday morning due to fog in the Bay Area. I’m sure it’s not going to be the last time! I see from reading up about it that the weather and sea conditions for fog are actually favored in the summer, though. Another type of fog, called tule fog, is a ground fog settling in the Central Valley. This fog sometimes reaches the Bay Area as well, and it is possible for San Francisco to have both kinds of fog!