Weather Alerts Map

San Mateo weather alerts

1 warning and 1 advisory are in effect for San Mateo, CA. The most serious is a coastal flood advisory.

The National Weather Service issues alerts for San Mateo as part of San Mateo County.

Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS

Active alerts for San Mateo

Coastal Flood Advisory

San Francisco; Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Northern Monterey Bay; Southern Monterey Bay and Big Sur CoastUntil · NWS San Francisco CA

HIGH SURF WARNING REMAINS IN EFFECT UNTIL 4 AM PST SUNDAY... ...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 6 PM PST THIS EVENING

Full alert text
* WHAT...For the High Surf Warning, dangerously large breaking
waves of 25 to 35 ft, with occasional sets of 40 to 50 ft at
favored breakpoints. For the Coastal Flood Advisory, large
breaking waves will run up beaches and crash over seawalls,
inundating adjacent, low-lying infrastructure.

* WHERE...All Pacific Coast Beaches.

* WHEN...For the High Surf Warning, until 4 AM PST Sunday. For the
Coastal Flood Advisory, now through 6 PM PST today.

* 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. Dangerously large breaking waves can overpower
swimmers, pulling people into the sea from beaches, jetties,
and rocks resulting in significant physical injury and
increasing the risk of drowning. Waves can sweep across the
shoreline without warning, pulling people into the sea from
beaches, jetties, and rocks.

* ADDITIONAL DETAILS...The Coastal Flood Advisory today is
specifically for the Pacific Coast, where large breaking waves
will spill over sea walls and run up beaches onto adjacent
infrastructure.

What to do: 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. Everyone should remain out of the water due to life-threatening surf conditions. Stay off of jetties, piers, and other waterside infrastructure.

High Surf Warning

San Francisco; Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Northern Monterey Bay; Southern Monterey Bay and Big Sur CoastUntil · NWS San Francisco CA

HIGH SURF WARNING REMAINS IN EFFECT UNTIL 4 AM PST SUNDAY... ...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 6 PM PST THIS EVENING

Full alert text
* WHAT...For the High Surf Warning, dangerously large breaking
waves of 25 to 35 ft, with occasional sets of 40 to 50 ft at
favored breakpoints. For the Coastal Flood Advisory, large
breaking waves will run up beaches and crash over seawalls,
inundating adjacent, low-lying infrastructure.

* WHERE...All Pacific Coast Beaches.

* WHEN...For the High Surf Warning, until 4 AM PST Sunday. For the
Coastal Flood Advisory, now through 6 PM PST today.

* 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. Dangerously large breaking waves can overpower
swimmers, pulling people into the sea from beaches, jetties,
and rocks resulting in significant physical injury and
increasing the risk of drowning. Waves can sweep across the
shoreline without warning, pulling people into the sea from
beaches, jetties, and rocks.

* ADDITIONAL DETAILS...The Coastal Flood Advisory today is
specifically for the Pacific Coast, where large breaking waves
will spill over sea walls and run up beaches onto adjacent
infrastructure.

What to do: 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. Everyone should remain out of the water due to life-threatening surf conditions. Stay off of jetties, piers, and other waterside infrastructure.

Map data: NWS, OpenFreeMap, OpenStreetMap

Tornado history within 25 miles of San Mateo

10 tornadoes have been recorded within 25 miles of San Mateo since 1950, injuring 3 people. The most recent was on March 20, 2005 (rated F1).

EF0: 4EF04EF1: 4EF14EF2: 2EF22EF3: 0EF3EF4: 0EF4EF5: 0EF5
Tornadoes by (E)F rating

Strongest tornadoes within 25 miles of San Mateo

DateRatingCountyPath lengthWidthDeathsInjuries
January 11, 1951F2Santa Clara County5.7 mi10 yd00
May 5, 1998F2Santa Clara County0.6 mi100 yd01
March 20, 2005F1San Mateo County3 mi30 yd00
January 14, 1980F1Stanislaus County0.3 mi67 yd01
May 5, 1998F1Santa Clara County0.3 mi80 yd01

Most recent tornadoes

DateRatingCountyPath lengthWidthDeathsInjuries
March 20, 2005F1San Mateo County3 mi30 yd00
May 5, 1998F2Santa Clara County0.6 mi100 yd01
May 5, 1998F1Santa Clara County0.3 mi80 yd01
February 7, 1998F0San Mateo County0.2 mi50 yd00
February 6, 1998F0Santa Clara County0.1 mi30 yd00

California tornado history and map →

How often alerts are issued for San Mateo County

Alert type2016–2025Last issued
Flood Advisory143November 13, 2026
Flood Warning19February 13, 2025
Severe Thunderstorm Warning18December 26, 2025
Flash Flood Warning14December 25, 2025
Tornado Warning2January 5, 2026

Full San Mateo County alert history →

About San Mateo

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