SAN FRANCISCO — Dense Tule fog, record low temperatures and incoming offshore winds are shaping weather conditions across the San Francisco Bay Area this week, the National Weather Service said Monday.
A pattern of high pressure offshore and lower pressure inland has allowed fog from the Central Valley to drift westward for several days. Moisture left behind by early-season rainfall has helped trap fog near the surface, forecasters said.
San Francisco reached a high of only 50°F on Sunday, breaking a 103-year-old record for the date.
A freeze warning was also issued for parts of Southern California, including Death Valley, where temperatures could fall to 30°F, potentially harming crops and exposed pipes.
Conditions are expected to shift midweek as a dry low-pressure system moves south through the Great Basin, bringing overnight offshore winds of 30–45 mph to higher elevations.
Coastal hazards continue from Sonoma to Monterey counties, where waves of 10–14 feet—and more than 20 feet at some locations—are forecast through Wednesday. King tides arriving Tuesday through Sunday may cause minor flooding around shoreline communities.
Long-range forecasts show a warming trend later in December, with generally dry conditions expected after the winds subside.
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