Tomorrow | Weather | San Mateo, California

Active Weather Warnings

Heat Advisory
Coastal Flood Advisory

Thursday, June 11, 2026

Day 88°

Night 57°

Precipitation 0 %

Wind 9 mph

UV Index (0 - 11+) 11

Friday

Weather Forecast History

Last Year's Weather on This Day (June 11, 2025)

Day

68°

Night

54°

Wind

12 mph

UV Index

Precipitation

49 %

Weather Alerts and Warnings for

Moderate Expected Likely

Heat Advisory

Heat Advisory issued June 10 at 11:37AM PDT until June 11 at 11:00PM PDT by NWS San Francisco CA

Jun 11, 12:00 PM → Jun 11, 11:00 PM

WHAT: High temperatures between 90 and 103 for interior valleys
and higher elevations. High temperatures between 85 and 96 degrees
for the Bay Shoreline.

WHERE: North Bay Interior Mountains and Valleys, and San Francisco
Bay Shoreline.

WHEN: From noon to 11 PM PDT Thursday.

IMPACTS: This level of heat affects most individuals sensitive to
heat, especially those without effective cooling and/or adequate
hydration. Impacts possible in some health systems and in
heat-sensitive industries.

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Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

Updated: Jun 10, 11:51 AM Source: NWS Alert

Minor Expected Likely

Coastal Flood Advisory

Coastal Flood Advisory issued June 9 at 11:09PM PDT until June 13 at 1:00AM PDT by NWS San Francisco CA

Jun 11, 7:00 PM → Jun 13, 1:00 AM

WHAT: Up to 1.5 ft of inundation above ground level is
possible in low-lying areas near shorelines and tidal waterways.

WHERE: Bayshore regions near the San Francisco Bay.

WHEN: From 7 PM Thursday to 1 AM PDT Saturday.

IMPACTS: Flooding of lots, parks, and roads with only
isolated road closures expected.

ADDITIONAL DETAILS: At the San Francisco tidal gauge, high tide
is expected to be 1.2 ft above normal (6.98 ft MLLW) at 851 PM
on Thursday the 11th, and 1.5 ft above normal (7.23 ft MLLW) at
934 PM on Friday the 12th. High tide varies up to 90 minutes
earlier or later along the Pacific Coast and through the San
Francisco Bay, respectively.