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They are taking part in a commercial shoot for T-Mobile.
Wind permitting, the landing spots include Justin Herman Plaza, the rooftop of a Pier 39 garage, the Marina Green and Moscone Recreation Center.
Some of the jumpers will be coming down in the shape of a "T." They will also be in costumes, so it will look like surfers, doctors and firemen are dropping from the sky. And, yes, there will be one dressed up as Elvis.
The parachutists will take off from Oakland just before noon.
The skydivers are from Skydiving Innovations, a professional parachute team out of San Diego.
The fun doesn't stop there. A separate airplane group will be blowing smoke starting around 11 a.m. along the Embarcadero between the Golden Gate Bridge and the Bay Bridge.
T-Mobile is setting up a big screen at Justin Herman Plaza so the public can get a good view of all the action.
The project has all the needed permits and was approved by the Federal Aviation Administration, the San Francisco Port Authority and the Recreation and Park Department.
San Francisco police will be assisting at all four jump sites.
The event is free for the watching, but it's costing T-Mobile $17,500. That's how much the city of San Francisco is charging the company to use us as a backdrop.