Marine Weather and Tide Forecast for South San Francisco, CA

SHORT TERM
Issued at 1154 PM PDT Sat Oct 10 2026 (Tonight through Monday)

The northerly ACV-SFO pressure gradient has increased to 5.9 mb while the onshore SFO-SAC pressure gradient is 1.0 mb. Surface winds are largely gusty from the northwest over the coastal waters in response to the northerly pressure gradient, however wind favored gaps and passes mainly in the East Bay are indicating ongoing gusty winds as well. 24 hour temperature trends are mostly cooler across the forecast area as cold air advection is combining with nocturnal radiative cooling. Daytime highs Sunday and Monday will be in the 60s/70s, warmest inland. Lows will be in the 40s/30s, coldest far inland valleys, except near 50 along the immediate coastline and bays.

Spotty very light measurable rain and/or drizzle (less than 0.10")
is possible across southernmost Monterey County due to a surface to lower/mid level low pressure circulation (it will be weakening since surface pressures are forecast to increase) moving southward along the Big Sur coast Sunday night and Monday. Dry weather will prevail over most of the forecast area through early week.

LONG TERM
Issued at 1154 PM PDT Sat Oct 10 2026 (Monday night through next Saturday)

The forecast area will remain under cool and dry conditions Tuesday with a daytime warming trend developing mid to late week.
Thursday to Saturday daytime highs are forecast to return above mid October normal with highs in the 80s to lower 90s. 500 mb ridging will advance eastward over our forecast area mid to late week, bringing a return to warmer daytime temperatures.

AVIATION
(12Z TAFS)
Issued at 410 AM PDT Sun Oct 11 2026

VFR except for KHAF and the Monterey Bay terminals, where MVFR ceilings will persist into mid-morning. A cooler, drier airmass has settled over our area resulting in limited coverage of marine layer stratus. Further south where the warmer air over the water (upper 50s) is advecting directly into the Monterey Bay area and Salinas Valley, into a cooler airmass over the coastal areas, where seeing more robust stratus development.

Vicinity of SFO...VFR will persist through the forecast period with occasionally breezy onshore flow this afternoon, a good day to fly.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...A more direct fetch of warm/moist air advection onshore to a cooler airmass over land is resulting in MVFR ceilings resting on top of the marine layer until mid- morning. VFR through the remainder of the TAF period once ceilings lift.

MARINE
(Today through Friday)
Issued at 410 AM PDT Sun Oct 11 2026

Strong northwest breezes continue to produce rough to very rough across our coastal waters. Frequent gale to near gale force gusts can be expected through the early evening hours today. The strong winds and long period southerly swell will result in a confused sea state into the beginning of next week.

BEACHES
Issued at 1055 AM PDT Sat Oct 10 2026

Heading to the beach this weekend? The sun will be out, but beaches conditions will be less than ideal. A cold front will bring gusty winds over the coastal waters and nearby beaches.
More importantly, the surf zone will remain very energetic. Long period southerly swell from distant Tropical Storm Rachel will build in height through the weekend, bringing an increased risk of sneaker waves and strong rip currents. Long period westerly swell from a gale force low in the Central North Pacific will arrive Sunday, bringing breaking waves 13-16 feet. The large tidal swings will also result in coastal erosion as water and waves are brought farther up the beach than normal, especially during high tide. Remain off jetties, piers, rocks, and other waterside infrastructure as waves can sweep across the shoreline without warning, pulling people into the sea. Remain out of the water to avoid hazardous surf and strong rip currents and never turn your back on the ocean!

MM

MTR WATCHES/WARNINGS/ADVISORIES
CA...Beach Hazards Statement through Monday evening for CAZ006-505- 509-529-530.

Coastal Flood Advisory until 3 PM PDT Tuesday for CAZ006-508-529- 530.

Coastal Flood Advisory until 4 PM PDT Wednesday for CAZ506.

PZ...Small Craft Advisory until 9 AM PDT this morning for Mry Bay-Pt Reyes to Pigeon Pt 0-10 nm.

Small Craft Advisory until 9 PM PDT this evening for Pt Arena to Pt Reyes 0-10 nm.

Small Craft Advisory until 3 PM PDT this afternoon for Pigeon Pt to Pt Pinos 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm.

Gale Warning until 3 PM PDT this afternoon for Pt Arena to Pt Reyes 10-60 NM.

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