Freezing temps expected to chill parts of Bay Area this weekend

Temperatures are expected to drop below freezing in some parts of the Bay Area this weekend as a dry air mass swoops in from the north, forecasters said.

By nightfall Friday, lows are expected to hit freezing temperatures near Walnut Creek and Pleasanton in the East Bay and in the upper-20s in parts of Sonoma and Napa counties, said Cynthia Palmer, a meteorologist for the National Weather Service.

San Francisco should see lows in the mid-40s.

“Tonight will be our coldest night, but we will continue to see some chilly conditions again this weekend,” Palmer said. “But we should be gradually warming each morning.”

Wind gusts pummeled the East Bay hills and North Bay mountains Thursday, peaking at 63 mph in Sonoma. Those gusts are expected to die down Friday but pick back up Sunday as another air mass moves in from the Great Basin, Palmer said.

Chilly temperatures are expected to persist Monday and Tuesday, with forecasters predicting a dry and cool New Year’s Eve.

No rain is expected over the next week, according to the National Weather Service.

Gwendolyn Wu is a San Francisco Chronicle staff writer. Email: Twitter: @gwendolynawu

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