textproduct: San Francisco Bay Area

KEY MESSAGES

Updated at 1238 PM PDT Fri Sep 25 2026

- Cooler conditions through the weekend

- Warmer temperatures next week

SHORT TERM

Issued at 1238 PM PDT Fri Sep 25 2026 (This evening through Sunday night)

Lingering stratus is dissipating across the East Bay, the San Mateo coast, the southern Monterey Bay and the Big Sur Coast, while high clouds flow over the North Bay. A weak and dry cold front passed through the SF Bay Area this morning and is making its way through the Central Coast, bringing breezy conditions in its wake through the afternoon and evening hours, and starting a cooling and moistening trend across the region. High temperatures today will range from the upper 70s to middle 80s in the inland valleys, the upper 80s to lower 90s in the southern reaches of Monterey County, the upper 60s to the upper 70s near the Bays, and the lower to middle 60s along the Pacific coast. Overnight tonight, some weak offshore flow is possible in the higher elevations of the North and East Bay.

By Saturday, a trough will develop in the eastern Pacific, and through the weekend, strengthen into a cut-off low and march into the state, continuing the cooling trend towards the rest of the weekend. Highs in the inland valleys will range from the 70s into the lower 80s, while the coast and the Bays see highs ranging from the 60s to the lower 70s. The warmest spots in southern Monterey County will rise to the upper 80s to the lower 90s on Saturday. Nocturnal drying is possible Saturday night into Sunday morning within higher elevations above the marine layer.

LONG TERM

Issued at 1238 PM PDT Fri Sep 25 2026 (Monday through next Thursday)

Ridging, or at the very least more zonal flow, will return to the region on Monday as the cut-off low moves off to the southeast, causing temperatures to rise near to slightly above (up to 10 degrees) the seasonal average for the middle of next week. High temperatures in the middle 80s to lower 90s are expected in the inland valleys, the middle 70s to the middle 80s near the bays, and the middle 60s to lower 70s along the coast. Beyond that, forecast uncertainty rises as ensemble model cluster analysis starts to diverge on the upper level pattern across the western United States.

AVIATION

(06Z TAFS) Issued at 840 PM PDT Fri Sep 25 2026

VFR is expected to prevail for a majority of the forecast period for all terminals. Monterey Bay has a chance of IFR/LIFR fog/stratus developing late in the overnight period, with low confidence in timing and extent.

Vicinity of SFO...VFR conditions expected through a majority of the forecast period with gusty winds easing by midnight tonight. There is a slight chance for MVFR ceilings for a few hours after sunrise Saturday but confidence is low as the marine layer continues to be relatively weak and dry air in the wake of a cold front that passes through our area earlier today.

SFO Bridge Approach...Similar as SFO.

Monterey Bay Terminals...As mentioned above, there's a chance for more impactful IFR/LIFR stratus/fog developing late in the overnight hours, lifting by mid-morning Saturday. Low confidence in the exact timing and extent.

MARINE

(Tonight through next Thursday) Issued at 840 PM PDT Fri Sep 25 2026

Fresh to strong northerly breezes are forecast to continue through the weekend. Gale force gusts are possible across Monterey Bay south to Big Sure through Sunday evening. Tropical storm activity will produce long period southerly swell that begins to increase by the beginning of next week.

FIRE WEATHER

Issued at 430 AM PDT Fri Sep 25 2026

Transition day across the district as a weak dry cold front sweeps through. As of this writing the front is just pushing through the N Bay and will traverse through the Central Coast by this afternoon. The passing front will kick off a cooling and moistening trend, which will continue through the weekend. More importantly for a fire weather standpoint the passing front will cause an uptick in winds. Winds will likely be strongest later this afternoon and this evening. Winds ease overnight, but a weak offshore push develops for early Saturday morning. Nothing to be alarmed over as it will be weak and mainly N and E Bay higher terrain.

MM

MTR WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...Small Craft Advisory until 9 PM PDT this evening for Mry Bay.

Small Craft Advisory until 3 AM PDT Saturday for Pigeon Pt to Pt Pinos 0-10 nm-Pt Arena to Pt Reyes 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm.

Small Craft Advisory until 3 AM PDT Monday for Pt Pinos to Pt Piedras Blancas 0-10 nm.

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

Small Craft Advisory until 3 PM PDT Saturday for Pigeon Pt to Pt Pinos 10-60 NM.