The famous fog of San Francisco, California is a specific case of sea fog. Sea fog is a specific type of fog, which is develops as a result of wind blowing over cooler water. The water is often cool enough to lower the temperature of the moist air to the dewpoint, causing fog generation. Coastal areas in Mediterranean climates, such as San Francisco, have especially high occurrences of sea fog blowing off the ocean to just a few miles inland.
Temperatures can become very cold when the fog comes rolling in. Many people suggest wearing layers to make it easy to adjust to the changing conditions. The San Francisco fog is a very breathtaking sight.