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Updated:October 3, 2026 6:01 pm PDT

Heat Advisory HEAT ADVISORY  
Los Angeles County

  Effective: Sat, 10/3 12:00pm Severity:  Moderate 
  Updated: October 3, 2026 6:01 pm Urgency: Expected
  Expires: Sun, 10/4 3:00am Certainty: Likely

Areas Affected: Sonoma Coastal Range - North Bay Interior Mountains - North Bay Interior Valleys - San Francisco Bay Shoreline - East Bay Interior Valleys - Santa Cruz Mountains - Santa Clara Valley Including San Jose - Eastern Santa Clara Hills - East Bay Hills - Southern Salinas Valley/Arroyo Seco and Lake San Antonio - Santa Lucia Mountains and Los Padres National Forest - Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park
 
Alert Details:
* WHAT...Hot conditions with maximum temperatures in the mid-90s to
low-100s. Mild minimum temperatures and weak onshore flow will
limit overnight relief.

* WHERE...The East Bay and San Francisco Bay Shoreline, North Bay
Interior Mountains and Valleys, The Santa Clara Valley and Eastern
Hills, The Santa Cruz Mountains, Interior Monterey County and the
Santa Lucia Range, Most of San Benito County and the Cholame Hills
in Southeast Monterey County, and Southern Salinas Valley/Arroyo
Seco and Lake San Antonio.

* WHEN...Until 10 PM PDT Wednesday.

* IMPACTS...This level of heat affects anyone without effective
cooling and/or adequate hydration. Impacts likely in some health
systems, heat-sensitive industries and infrastructure.

Information:
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.
Heat Advisory HEAT ADVISORY  
Los Angeles County

  Effective: Sat, 10/3 12:00pm Severity:  Moderate 
  Updated: October 3, 2026 6:01 pm Urgency: Expected
  Expires: Sun, 10/4 3:00am Certainty: Likely

Areas Affected: San Francisco - Marin Coastal Range - Northern Salinas Valley/Hollister Valley and Carmel Valley - Northern Monterey Bay
 
Alert Details:
* WHAT...Hot conditions with maximum temperatures in the low-80s to
low-90s. Mild minimum temperatures and weak onshore flow will limit
overnight relief.

* WHERE...The Marin Hills, Northern Monterey Bay, San Francisco, and
Northern Salinas Valley/Hollister Valley and Carmel Valley.

* WHEN...Until 10 PM PDT Sunday.

* IMPACTS...This level of heat affects anyone without effective
cooling and/or adequate hydration. Impacts likely in some health
systems, heat-sensitive industries and infrastructure.

Information:
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.
Heat Advisory HEAT ADVISORY  
Marin County

  Effective: Sat, 10/3 12:00pm Severity:  Moderate 
  Updated: October 3, 2026 6:01 pm Urgency: Expected
  Expires: Sun, 10/4 3:00am Certainty: Likely

Areas Affected: Sonoma Coastal Range - North Bay Interior Mountains - North Bay Interior Valleys - San Francisco Bay Shoreline - East Bay Interior Valleys - Santa Cruz Mountains - Santa Clara Valley Including San Jose - Eastern Santa Clara Hills - East Bay Hills - Southern Salinas Valley/Arroyo Seco and Lake San Antonio - Santa Lucia Mountains and Los Padres National Forest - Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park
 
Alert Details:
* WHAT...Hot conditions with maximum temperatures in the mid-90s to
low-100s. Mild minimum temperatures and weak onshore flow will
limit overnight relief.

* WHERE...The East Bay and San Francisco Bay Shoreline, North Bay
Interior Mountains and Valleys, The Santa Clara Valley and Eastern
Hills, The Santa Cruz Mountains, Interior Monterey County and the
Santa Lucia Range, Most of San Benito County and the Cholame Hills
in Southeast Monterey County, and Southern Salinas Valley/Arroyo
Seco and Lake San Antonio.

* WHEN...Until 10 PM PDT Wednesday.

* IMPACTS...This level of heat affects anyone without effective
cooling and/or adequate hydration. Impacts likely in some health
systems, heat-sensitive industries and infrastructure.

Information:
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.
Heat Advisory HEAT ADVISORY  
Marin County

  Effective: Sat, 10/3 12:00pm Severity:  Moderate 
  Updated: October 3, 2026 6:01 pm Urgency: Expected
  Expires: Sun, 10/4 3:00am Certainty: Likely

Areas Affected: San Francisco - Marin Coastal Range - Northern Salinas Valley/Hollister Valley and Carmel Valley - Northern Monterey Bay
 
Alert Details:
* WHAT...Hot conditions with maximum temperatures in the low-80s to
low-90s. Mild minimum temperatures and weak onshore flow will limit
overnight relief.

* WHERE...The Marin Hills, Northern Monterey Bay, San Francisco, and
Northern Salinas Valley/Hollister Valley and Carmel Valley.

* WHEN...Until 10 PM PDT Sunday.

* IMPACTS...This level of heat affects anyone without effective
cooling and/or adequate hydration. Impacts likely in some health
systems, heat-sensitive industries and infrastructure.

Information:
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.