Marine Weather and Tide Forecast for Piedmont, 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
(18Z TAFS)
Issued at 1039 AM PDT Sun Oct 11 2026

Post frontal dry airmass led to mostly VFR this morning except a few CIGs at HAF,MRY,SNS. Dry northerly flow will persist leading to VFR all terminals through the period.

Vicinity of SFO...VFR

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR. Diurnal wind patterns.

MARINE
(Today through Friday)
Issued at 1039 AM PDT Sun Oct 11 2026

Hazardous conditions persist over the coastal waters due to fresh breezes to gale force winds and rough seas. Strongest winds will be over the outer waters north of Pigeon Point. The strong winds and long period southerly swell will result in a confused sea state into the beginning of next week.

BEACHES
Issued at 1042 AM PDT Sun Oct 11 2026

Buoy reports this morning still indicated some solid swell entering the coastal waters. As such, still seeing an energetic the surf zone. Give the observed height and period isolated breaking waves 18-20 ft are possible at favored break points. Long period southerly swell will persist through the weekend, bringing an increased risk of sneaker waves and strong rip currents. 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 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- Pt Reyes to Pigeon Pt 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.