The initial report came in around 1:45 p.m. of five people in the water near Salmon Creek.
Law enforcement told ABC7's Dion Lim as they tried to talk to the victims, hypothermia had set in, and it was difficult for the victims to communicate as to what exactly happened.
Rescuers dealt with 15 foot swells amid a small craft advisory.
MORE: 13-year-old sole survivor of deadly Bodega Bay boating trip describes ordeal, last moment with dad
It is still too early to tell whether or not that advisory played a role in the capsizing.
The Sonoma County Sheriff's Office are trying to piece together exactly how incident happened as conditions in the area were quite brutal with the winds and high swells.
The U.S. Coast Guard and Sonoma County firefighters are investigating.
MORE: Wife of missing Bodega Bay fisherman confirms teen sons were also on boat that capsized
This is the third deadly incident involving a capsized boat in the area this month.
On November 2, four people died just north of Bodega Bay.
Then on November 4, one person died after another boat capsized in the same area.