textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 1139 AM PST Thu Dec 4 2025

- Persistent forecast through the next seven days with benign conditions and no precipitation expected

- Hazardous cold conditions continue in the interior Central Coast Friday morning

- Impacts from Tule Fog continue in the interior East Bay

UPDATE

Issued at 909 PM PST Thu Dec 4 2025

The forecast remains on track tonight. A slow and gradual warming trend sets in through the middle of next week. However, a Cold Weather Advisory remains in effect overnight into Friday morning until 8AM for interior portions of the Central Coast. Some high cloud coverage is helping to slow down radiational cooling across the rest of our area, with warmer overnight lows than we've seen the past couple of nights.

SHORT TERM

Issued at 1139 AM PST Thu Dec 4 2025 (This afternoon through Friday)

Satellite imagery shows lingering stratus in the interior East Bay, an outgrowth of the Tule Fog across the Central Valley, and the very southern portion of the Salinas Valley. Isolated patches of higher clouds are scattered across the region. The general weather pattern continues to be dominated by ridging in the eastern Pacific, which has been edging into the western United States after a trough pulled away into the Central United States. The large scale flow continues to come from the north, and generally mild offshore flow persists across the higher elevations of the Bay Area, although as the offshore gradient begins to significantly weaken, the offshore flow will likewise decrease. Expect another round of Tule Fog impacts tonight into Friday morning, mainly across the interior Bay Area with potential impacts in the North Bay valleys.

Highs today range from the upper 50s to the middle 60s across the lower elevations, except in the interior East Bay where highs remain in the lower 50s. A Cold Weather Advisory remains in effect for the interior Central Coast, including the southern Salinas Valley, for the midnight to 8 AM timeframe on Friday morning, as lows reach the lower to middle 30s generally and down into the 20s for isolated locations in the higher elevations. Elsewhere, lows range from the lower to middle 40s in the lower elevations, reaching into the upper 40s in the higher elevations. Temperatures in the interior East Bay are expected to warm slightly tomorrow into the lower 60s, while the rest of the region sees highs around 1 to 2 degrees warmer than today's.

LONG TERM

Issued at 1139 AM PST Thu Dec 4 2025 (Friday night through next Wednesday)

The forecast conditions remain so stable that a lot of my discussion from yesterday still applies. We are still expecting the ridging to build into the southwestern US, promoting a gradual warming trend through the early part of next week with the inland valleys reaching the upper 60s to middle 70s. We are still expecting a couple of storm systems to get deflected into the Pacific Northwest and leave us with offshore showers, potential light drizzle in the Sonoma coastal ranges, and disappointment for fans of wet weather everywhere else. We are still seeing the next chance for widespread rain towards the middle of the month with very high levels of uncertainty for that part of the forecast.

AVIATION

(06Z TAFS) Issued at 953 PM PST Thu Dec 4 2025

VFR for most sites but some potential for fog and lowered visibilities at STS, LVK, and APC. Highest confidence that STS and LVK will see MVFR to IFR conditions with low to moderate confidence that APC will see MVFR conditions. A tempo for lowered visibility may need to be added to APC with guidance showing clouds moving in and out during the early morning hours. Otherwise, winds remain light and offshore tonight before a more sustained push of onshore winds returns by tomorrow afternoon.

Vicinity of SFO...VFR. Winds remain light through tomorrow morning before moderate onshore winds return during the afternoon/evening hours.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR. Light, offshore winds continue overnight with moderate onshore winds returning during the afternoon/evening. Winds look to weaken and shift offshore again by tomorrow night.

MARINE

(Tonight through next Wednesday) Issued at 953 PM PST Thu Dec 4 2025

Winds build across the outer and northern inner waters tonight with fresh to strong gusts expected. Elevated winds with fresh to strong gusts persist into next week and gradually spread into the inner waters starting late Saturday. Localized near gale force gusts are possible across the outer waters through Saturday. Moderate seas continue with seas building to between 6 to 8 feet Friday through Sunday.

MTR WATCHES/WARNINGS/ADVISORIES

CA...Coastal Flood Advisory until 3 PM PST Sunday for CAZ006-506-508- 529-530.

Cold Weather Advisory until 8 AM PST Friday for CAZ516-518.

PZ...Small Craft Advisory from 9 AM Friday to 3 AM PST Saturday for Pt Arena to Pt Reyes 0-10 nm.

Small Craft Advisory until 9 AM PST Saturday for Pt Arena to Pt Reyes 10-60 NM.

Small Craft Advisory from 3 AM Friday to 9 AM PST Saturday for Pigeon Pt to Pt Pinos 10-60 NM.