The City will celebrate the Fourth of July with its usual bayside fireworks show as well as a host of free concerts in and around the Fisherman's Wharf area.
The 21-minute fireworks show will begin at 9:30 p.m. This year's theme is "Spirit of America." About 4,000 different effects will be launched from each of two locations, at the foot of the Municipal Pier at Aquatic Park, and on a barge anchorednear Pier 39.
Producer Jeff Thomas, of the company Pyrospectaculars by Souza, which is putting on the fireworks, said the fireworks will be computer-controlled, but that technicians will be on hand at the launch sites in case of emergencies.
Thomas said the show will be accompanied by patriotic music, including marches by John Philip Sousa and songs by Ray Charles.
Before the show, revelers can attend free concerts in and around Aquatic Park.
Elsewhere in The City, the Golden Gate Park Band will play a concert at 1 p.m. at the Botanical Gardens in Golden Gate Park.
Traffic is expected to be heavy in San Francisco, and The City is encouraging visitors to leave their cars at home. Three extra Caltrain trains will run after the fireworks display after the last scheduled holiday train at 9 p.m. The first of these departs the station at Fourth and King streets at 11 p.m.
Bay Area Rapid Transit District will operate on a standard holiday schedule, with trains running from 8 a.m. until 12 a.m.