The fire was initially reported at 4:39 p.m. near Lariat Lane and Claitor Way.
The blaze has destroyed one home and damaged another, according to city officials. Eleven nearby homes have been evacuated.
No injuries have been reported.
The Berryessa Community Center at 3050 Berryessa Road is open to residents affected by the fire. So far, less than 10 residents have been assisted.
Firefighters with both the San Fire Department and Cal Fire will remain at the scene until the fire is fully contained, city officials said.
It is breezy near this fire. Northerly winds gusting to 14mph w/low relative humidity. Hope the crews make quick progress. https://t.co/yMOw3yj0a9— Sandhya Patel (@SandhyaABC7) July 12, 2017
Click here for info on evacuation centers and other active fires in NorCal.