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San Mateo County Alerts
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Updated:October 31, 2026 2:15 pm PDT

Coastal Flood Advisory COASTAL FLOOD ADVISORY  
San Mateo County

Effective: Sat, 10/31 4:45am Severity: Minor
Updated: October 31, 2026 2:15 pm Urgency: Expected
Expires: Sat, 10/31 6:00pm Certainty: Likely

Areas Affected: San Francisco - North Bay Interior Valleys - San Francisco Bay Shoreline - Northern Monterey Bay - Southern Monterey Bay and Big Sur Coast
 
Alert Details:
* WHAT...Up to 1.5 ft of inundation above ground level is
possible in low-lying areas near shorelines and tidal
waterways.

* WHERE...Bayshore locations along the San Francisco Bay, San Pablo
Bay, and Monterey Bay.

* WHEN...Until 6 PM PDT Sunday.

* IMPACTS...High tides will result in flooding of low-lying
infrastructure, isolated road closures, and coastal erosion.
Rising tides will bring water and waves farther up the beach
than normal, restricting escape from beaches and coastal
areas. More substantial impacts are expected along bayshore
Marin County where increased flooding is anticipated across
low lying areas.

* ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide
is expected to be 1.5 feet above normal (7.3 ft MLLW) at 03:44
PM on Saturday 10/31 and 1.0 ft above normal (6.8 ft MLLW) on
Sunday 11/01 at 3:59 PM. These predictions include up to 1.5 ft
of surge that will enhance the astronomical tide and flooding
threat. High tide varies up to 90 minutes earlier or later along
the Pacific Coast and through the San Francisco Bay,
respectively.

Information:
If travel is required, allow extra time as some roads may be
closed. Do not drive around barricades or through water of
unknown depth. Take the necessary actions to protect flood-prone
property.
Coastal Flood Advisory COASTAL FLOOD ADVISORY  
San Mateo County

Effective: Sat, 10/31 4:45am Severity: Minor
Updated: October 31, 2026 2:15 pm Urgency: Expected
Expires: Sat, 10/31 6:00pm Certainty: Likely

Areas Affected: Coastal North Bay Including Point Reyes National Seashore - San Francisco Peninsula Coast
 
Alert Details:
* WHAT...Up to 1.5 ft of inundation above ground level is
possible in low-lying areas near shorelines and tidal
waterways.

* WHERE...Pacific Coast.

* WHEN...Until 6 PM PDT Saturday.

* IMPACTS...High tides will result in flooding of low-lying
infrastructure, isolated road closures, and coastal erosion.
Rising tides will bring water and waves farther up the beach
than normal, restricting escape from beaches and coastal areas.

* ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide
is expected to be 1.5 feet above normal (7.3 ft MLLW) at 03:44
PM on Saturday 10/31. These predictions include up to 1.5 ft of
surge that will enhance the astronomical tide and flooding
threat. High tide varies up to 90 minutes earlier or later along
the Pacific Coast and through the San Francisco Bay,
respectively.

Information:
If travel is required, allow extra time as some roads may be
closed. Do not drive around barricades or through water of
unknown depth. Take the necessary actions to protect flood-prone
property.