A high wind advisory is in effect Sunday afternoon for the San Francisco and Monterey Bay areas until early Monday morning, according to National Weather Service officials.
A high wind advisory means that gusts of wind of at least 45 mph are likely, which can make driving difficult.
The high winds also may bring down trees and power lines, weather service officials said.
Winds will reach their peak between 4 p.m. and late evening and gradually slow after midnight Monday.
At least two trees were knocked down in San Francisco on Sunday, with one that temporarily blocked three lanes of traffic near bustling Portola Street and another that came crashing down on a car.
The strongest winds, however, will be near San Francisco Bay and the ocean, through coastal gaps and in the mountains near the coast.
Weather service officials are expecting winds of 20 to 30 mph with 40 to 50 mph gusts.
Already at Pt. Reyes National Seashore sustained winds have reached 40 mph with gusts of 54 mph, according to the National Weather Service.