textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 1230 PM PST Mon Jan 19 2026

- Dry weather, cool mornings, and mild afternoons this week

- Morning fog across the Delta, North Bay Valleys, and interior East Bay Valleys

SHORT TERM

Issued at 1230 PM PST Mon Jan 19 2026 (This evening through Tuesday)

Very little change in day to day conditions anticipated through mid week. A ridge of high pressure remains just off of the Pacific coast that will continue to result in temperatures 5-10 degrees above average (up to 15 in the higher terrain). Overnight, we are expecting patch to areas of fog in the North Bay Valleys while tule fog (dense at times) is forecast to advect westward into the interior East Bay Valleys and Delta again either late tonight or into Tuesday morning. If driving or commuting in these areas; be aware of the potential for dense fog and be prepared for sudden changes in visibility, remember to slow down, and use your low beam headlights.

Expecting a slight cool down on Tuesday as more widespread high clouds stream over the region, but only by a few degrees. Where mostly sunny sky conditions prevail, afternoon temperatures will warm into the mid 60s to lower 70s across the Central Coast and low to mid 60s elsewhere. That said, where fog lingers into late morning or early afternoon, expecting temperatures to only reach the upper 50s.

LONG TERM

Issued at 1230 PM PST Mon Jan 19 2026 (Tuesday night through next Sunday)

Dry conditions look to persist through much of the extended forecast. An upper level trough will develop over the north central Pacific between Tuesday night and Wednesday. A cut-off low will develop within that trough and move southward just off of the Bay Area/Central Coast, resulting in slightly cooler conditions and cloudier skies through late week. Thus, the greatest potential for rain will be across southern California and along the Santa Lucia Range on Thursday as a deeper plume of moisture advects inland to the south. However there is about a 20% probability of seeing greater than 0.01" and less than a 10% chance of that area seeing 0.10" over that area.

A weak upper level ridge is forecast to develop by this weekend and into early next week. As a result, a slight warming trend is forecast, but not as warm as what we have been the past week. Longer range guidance continues to push back our next potential widespread rainfall. It is not until late January or early February that we forecast widespread rain to return to the region.

AVIATION

(00Z TAFS) Issued at 324 PM PST Mon Jan 19 2026

VFR is expected to prevail for all terminals except KSTS where valley fog is expected to develop late tonight and persist through late morning Tuesday. Otherwise, we'll see light winds and drifting high clouds from south to north.

Vicinity of SFO...VFR is expected to prevail through the forecast period with low confidence, low chance of MVFR stratus in vicinity of KOAK and KSFO overnight into earl Tuesday morning.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR is expected to prevail through the forecast period with increase in offshore winds Tuesday morning through the remainder of the day.

MARINE

(Tonight through next Saturday) Issued at 324 PM PST Mon Jan 19 2026

Light northerly breezes will continue through the middle of the week and begin to gradually increase by the end of the work week into next weekend across our northern outer waters. A weak upper level disturbance will result in a subtle increase in northwesterly swell to moderate both Wednesday and Friday, quickly easing again into the weekend.

MTR WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...None.