A cold snap has hit the Bay Area. Here’s how low the temps will go and how long it will last

1 month ago San Francisco Chronicle

A quick moving storm dropped around a half-foot of snow in the Sierra Nevada and coated Northern California in showers and blustery winds on Sunday, and started the Bay Area’s week with a cold snap that will see temperatures plunge over the next couple of days.

The region will also see a chance of rain toward the end of the week, though nothing like the drenching that last month’s atmospheric rivers dropped.

A cold front moved through the Bay Area on Sunday and brought showers. The Bay Area is left with gusty winds and cold air on Monday.

San Francisco Chronicle

The low temperatures are the result of cold air sliding down mountainsides into the Bay Area’s valleys, and will keep mornings near or below freezing through Wednesday. The coldest locations Monday will be in the North Bay valleys, but freezing temperatures will also be possible in the Santa Clara Valley in the South Bay and in inland cities and towns along Interstate 680. These temperatures could be especially dangerous to unhoused people.

Cool afternoons will follow the frigid mornings, with the Bay Area around three to eight degrees below average over the next few days. Temperatures will start to slightly warm on Tuesday, as more rain is on the way later this week.

Bay Area Monday afternoon high temperatures.

San Francisco Chronicle

On tap this week

Afternoon temperatures will slowly climb to the mid 50s on Tuesday and mid-to-upper 50s on Wednesday as high pressure builds east, near the California and Nevada border. Weak offshore flow will help warm up the afternoon high temperatures. These afternoon highs will run one to four degrees below average, but will still be warmer than earlier in the week.

Rain on the horizon

The work week won’t see a chance of precipitation until Thursday night. This low pressure system will approach from the Gulf of Alaska and will move to the Pacific Northwest by the end of the week. The quick storm could bring showers to the Bay Area and light Sierra snow.

The next rain chance could start on Thursday night and wrap up on Friday afternoon.

San Francisco Chronicle

A break from the rain is expected on Saturday, but another chance of rain is possible on Sunday. This storm will approach from the Pacific Ocean and has the potential to bring an atmospheric river of moisture with it, though it’s too early to tell.

Monday breakdown

San Francisco

San Francisco will start off with chilly temperatures in the upper 30s with frost possible. Winds will blow from the northeast and could gust up to 30 mph before noon and then gust up to 20 mph by the afternoon. Skies will be sunny from sunrise to sundown with afternoon temperatures in the low-to-mid-50s. Along the Marina District to the Presidio, temperatures will get to the low 50s. Neighborhoods on the western side of the county, including Lakeshore, Parkside and Richmond, will also reach the low 50s.

Pacific Coast and Peninsula

Morning frost is possible with temperatures in the mid-30s across the Peninsula. Along the Pacific Coast from Pacifica to Half Moon Bay and the North Bay Coast, temperatures will start off in the mid-to-upper 30s. Skies will be sunny throughout the day and northeast winds could gust up to 25 mph. Later in the day, temperatures will only get to the lower 50s across the Peninsula, including South San Francisco, Daly City, San Mateo and San Carlos. Along the coast from Thornton State Beach to Half Moon Bay, temperatures will reach the low 50s. The North Bay Pacific Coast will be slightly cooler with highs ranging from the upper 40s to low 50s from Sea Ranch to Rodeo Beach.

North Bay

A freeze warning is in place until 9 a.m. from Cloverdale to Mill Valley and from Calistoga to American Canyon, with morning temperatures in the low-to-mid 30s. From Vallejo to Fairfield, temperatures will be in the mid 30s. Frost is possible. A wind advisory continues to 1 p.m. with strong north gusts up to 50 mph, and up to 70 mph for the highest mountain peaks. The skies will be sunny throughout the day and cool with afternoon temperatures in the low 50s to mid 50s.

Gusty north winds across the North Bay.

San Francisco Chronicle

Drought Map

Track water shortages and restrictions across Bay Area

Updated to include drought zones while tracking water shortage status of your area, plus reservoir levels and a list of restrictions for the Bay Area’s largest water districts.

In Marin County, San Rafael will reach the low 50s, as will Nicasio and Lagunitas in the foothills. In Sonoma County, Healdsburg to Rohnert Park will reach the mid 50s. Sonoma and Glen Ellen will reach the same afternoon temperatures. In Napa County, towns along the Silverado Trail will get to the lower 50s. In Solano County, cities including Vallejo, Cordelia and Suisun City will reach the low 50s. Winds could be up to 25 mph until the evening commute.

East Bay

A freeze warning continues until 9 a.m. for inland towns and cities, from Concord to Sunol and farther east in Livermore, with morning temperatures at or below freezing. Closer to the bay, like Antioch, Pinole, Alameda and Newark, temperatures will start off in the mid 30s. Morning frost is possible for the East Bay. Northeast winds could reach 25 mph until the early afternoon.

Skies will be sunny and temperatures will be cooler than average with highs in the lower 50s across the East Bay. Cities including Oakland and Fremont and along State Route 4, from Pittsburg to Martinez, afternoon temperatures will reach the low 50s. Inland communities, including Pleasant Hill, Walnut Creek, Dublin and Pleasanton, will also reach the low 50s.

South Bay and Santa Cruz

A freeze warning continues until 9 a.m. in the Santa Clara Valley and the Santa Cruz Mountains, with morning temperatures ranging from the upper 20s to low 30s. Closer to the coast, Capitola and Watsonville could see morning temperatures in the low-to-mid 30s with frost possible. The skies will be sunny and the wind will be light during the day, ranging between five to 10 mph.

During the afternoon, temperatures will be around five degrees cooler than average. San Jose, Palo Alto, Los Gatos and Milpitas will reach the low to mid-50s. The low 50s will be possible along Highway 101 for Morgan Hill. Mountain communities on State Route 9 between Boulder Creek and Felton, and along the coast from Santa Cruz to Aptos, will be slightly warmer, with temperatures in the 50s.

Michelle Apon is a San Francisco Chronicle meteorologist. Email: [email protected]

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