Another fire 400 kilometres to the north in Santa Barbara County was also lying down after dark. All but a handful of the evacuation orders that had affected some 1,200 homes and businesses earlier in the day were called off.
No damaged homes or injuries were reported in either fire. But the rugged terrain and unseasonably warm temperatures made firefighting difficult, creating some scary moments.
The flames that erupted in the fire-prone Rancho Bernardo area of San Diego quickly grew to 280 hectares, driven by hot, dry Santa Ana winds.
By late afternoon, the flames ripped through canyons to approach expensive homes and new subdivisions on the ridges. It spread to Rancho Santa Fe, one of the wealthiest US communities, known for its multimillion-dollar homes, golfing and horseback riding.
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On one road, people on bicycles and skateboards stopped to watch as a plane dumped water on flames 800 meters away. At least two high schools and three elementary schools were evacuated.
The city of San Diego issued between 16,000 and 17,000 evacuation orders, according to San Diego County Sheriff Bill Gore, including 300 that Police Chief Shelley Zimmerman described as mandatory. Gore said the sheriff's department issued an additional 5,000 evacuation orders outside city limits.
Meanwhile, in the Santa Barbara County community of Lompoc, the wildfire there also grew to about 280 hectares. There were downed power lines and heavy brush in the area, said David Sadecki of the Santa Barbara County Fire Department.
Months of drought have left much of the landscape ready to burn. Downtown Los Angeles has recorded just 15.44 centimetres of precipitation with little time left in the July 1-June 30 rain year. That's less than half its annual average rainfall.