Strong winds toppled a power line near the 210 Freeway and Sierra in Fontana.
At one point, the lights were out for over 2,000 homes as well as businesses in Los Angeles and Orange counties.
Most of the power has since been restored.
However, the National Weather Service says the strong winds may knock down more power lines and trees. Forecasters are also predicting scattered showers and occasional thunderstorms in some areas in the afternoon and evening.
The wind is expected to hit hardest in the canyon-facing areas in northeast Los Angeles. Strong gusty winds were also expected across the coastal and valleys of Los Angeles and Ventura counties.
A high wind warning, issued when winds blow at sustained speeds of 40 mph with gusts of at least 58 mph, went into effect at 3 a.m. Saturday in the Santa Clarita Valley and the L.A. County portions of the San Gabriel and Santa Monica mountains. It was scheduled to remain in effect until 3 p.m.
A less serious wind advisory is in effect for the San Fernando Valley, the Orange County coast and L.A. County's coastal zone, which stretches from Malibu to the Hollywood Hills and includes the Los Angeles-Metro area including downtown.
The wind advisory was set to expire Saturday afternoon in Orange and Los Angeles counties.
City News Service contributed to this report.