A frost advisory was in effect through 9 a.m. Monday for much of the Bay Area and the central coast, the National Weather Service said. The "hours of most concern" with the lowest temperatures — from 32 to 36 degrees — were expected to be 4 to 9 a.m., according to the weather service.
The areas expected to see chilly temperatures were the East Bay hills, the Santa Clara Valley in the South Bay and Santa Cruz County, the Santa Cruz Mountains, the Salinas, Hollister and Carmel valleys, and the mountains in San Benito and Monterey counties, the weather service said.
Temperatures dropped into the low 40s Sunday morning across the region, specifically along the bay shoreline and near the coast, said Roger Gass, a meteorologist with the weather service. Temperatures inland dropped to the mid-30s, causing frost, he said.
"Similar conditions may be a degree or two cooler than expected" for Monday, Gass said. "So frost formation is, again, going to be a concern, but we're not anticipating widespread subfreezing temperatures so that's some good news."
The weather service said those in homes without power and unsheltered people would be at most risk.
Thousands of residents in the Santa Cruz Mountains have endured days without power because of high winds after last week's storms downed trees and blocked roads.
Parts of the Santa Cruz Mountains were still without power Sunday morning, according to the Pacific Gas and Electric Co. outage map. It was not immediately clear how many customers were affected. PG&E representatives did not immediately respond to a request for comment.
"What's really important is that we continue to deal with power outages across the Bay Area and isolated areas so those individuals that don't have access to adequate heating — especially the unsheltered population, they're at greatest risk for these cold temperatures," Gass said.
"So we really encourage people to check on one another and help provide heating for those that may need it," Gass said.
Pets should also stay indoors overnight, weather officials said. Sensitive plants and pipes should be covered to prevent freezing.
Parisa Safarzadeh, press secretary for San Francisco Mayor London Breed, said city officials were monitoring the forecast.
The Department of Emergency Management "will activate the City's Emergency Operations Center early next week to coordinate infrastructure and utility response, public safety response, health and human services support, and public information," she said Saturday.
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