More Rain, Cold Temperatures Expected Across Bay Area This Week

SAN FRANCISCO, CA — Cold temperatures and more rain are forecast in the Bay Area heading into the New Year, according to weather officials.

A cold weather advisory has been issued for along the interior Bay Area and Central Coast, Clara County, with temperatures expected to drop as low as 34 degrees through Monday morning.

The cold will lead into second stretch of "potentially impactful rainfall" that is expected to start on New Year's Eve and last into next weekend, according to the National Weather Service.

Coast floodings from King Tides will impact the shorelines around San Francisco, Monterey Bay and San Pablo, according to the National Weather Service.

"A pattern change is on tap for Wednesday as a surface low-pressure system near the California/Mexico border picks up tropical moisture on its journey northward," according to the National Weather Service. "It's too soon to say with certainty, but minor flooding in low- lying, poor drainage, and urban areas as well as flashy creeks/streams can be expected as early as Wednesday."

There's a less than 15% chance of thunderstorms between Wednesday and Thursday, but it'll depend on the trajectory of the low-pressure system, according to weather officials.

The second stretch of rainfall comes following an atmospheric river that brought mudslides, flooding and snow to cities across Northern California.

Rain and flash flooding soaked roads in northern California, leading to water rescues from vehicles and homes and at least one confirmed death.

The storm caused flash flooding in cities like Los Angeles and avalanches in the Sierra Nevada mountain range, where Mammoth Mountain is located. A ski patroller who was injured in an avalanche at the mountain resort also died, while another was injured.

Parts of the North Bay saw the highest totals from the storm, with cities like Guerneville in Sonoma County receiving over 21 inches of rain, while the southern part of Marin County received over 11 inches.

The East Bay, in the cities of Oakland and San Leandro, saw more than 4 inches on average, while places like San Francisco and the peninsula received 3.8 inches on average.

The total amount of precipitation recorded between Dec. 21 and Dec. 28 this year is higher than in 2024 during the period.

Weather officials say tree debris from this past storm that may have yet to be disposed of may clog storm drains and gutters, resulting in more flooding.

Wind will increase during this time, but it is not expected to be impactful by itself," according to the National Weather Service. "However, the combination of wind and moist soils will increase the risk for downed trees, especially where trees have recently been weakened. If you are looking for a sign to put away your outdoor holiday decorations, this is it."

Bay City News contributed to this report.