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Heat Advisory Issued for California Areas as Triple-Digit Temperatures Expected

The National Weather Service has issued a Heat Advisory covering areas from Monterey to Mendocino counties, with temperatures that could reach triple digits inland.

3 reports on this incident · first at Sep 6, 2026, 2:24 a.m. ET

By AI ReporterFirst reported Sep 9, 2026, 7:28 p.m. ETUpdated Sep 9, 2026, 9:26 p.m. ET
The has issued a for areas including counties from Monterey to Mendocino, the Malibu Coast, Los Angeles County Beaches, Catalina, the San Gabriel Valley and the Bay Area, according to claycord.com. The begins and ends . The was issued on September 6, 2026, according to the . , claycord.com reported. Accounts of the expected conditions differ. NYPost.com reported record-breaking temperatures and tropical humidity combining to create a brutal blast expected to peak Wednesday, with temperatures soaring into the triple digits inland and oppressive moisture making it feel even worse. Claycord.com reported . Precaution guidance also differs by source. The Weather Service recommended avoiding strenuous outdoor activity and shifting necessary activity to earlier or later in the day, and never leaving pets in vehicles even with windows down, according to claycord.com. Health officials are urging residents to drink plenty of water, take frequent breaks and seek out air-conditioned spaces, according to nypost.com.

Earlier reports

  1. Sep 6, 2026, 2:31 a.m. ET

    Extreme Heat Warning Issued for 11 Zones in Puerto Rico Through 5 PM AST September 6

    The National Weather Service in San Juan has issued an Extreme Heat Warning for September 6, 2026, from 10:00 AM to 5:00 PM AST. The warning covers 11 zones including San Juan and Vicinity, Northeast, Southeast, Eastern Interior, North Central, Central Interior, Ponce and Vicinity, Northwest, Western Interior, Mayaguez and Vicinity, and Southwest. The affected areas include numerous municipalities across these zones.

    According to the warning, this level of heat can affect anyone without effective cooling or adequate hydration. The NWS advises drinking plenty of fluids, staying in air-conditioned rooms, staying out of the sun, and checking on relatives and neighbors. It warns not to leave young children and pets in unattended vehicles, as car interiors can reach lethal temperatures in minutes. For outdoor work, OSHA recommends frequent rest breaks in shaded or air-conditioned environments. Heat stroke is an emergency; call 9 1 1.

    The warning is in effect until 5:00 PM AST this afternoon.

  2. Sep 6, 2026, 2:24 a.m. ETFirst report

    Extreme Heat Warning Issued for San Juan and Vicinity, Northeast, and Southeast Puerto Rico

    The National Weather Service in San Juan has issued an Extreme Heat Warning for September 6, 2026, from 10:00 AM to 5:00 PM AST. The warning covers 11 zones across Puerto Rico, including San Juan and Vicinity, Northeast, Southeast, Eastern Interior, North Central, Central Interior, Ponce and Vicinity, Northwest, Western Interior, Mayaguez and Vicinity, and Southwest. Affected cities include San Juan, Ponce, Mayaguez, and many others.

    The warning states that this level of heat can affect anyone without effective cooling or adequate hydration. Impacts are expected to be most pronounced across coastal sections, lowlands, interior valleys, and urban areas. The National Weather Service advises drinking plenty of fluids, staying in air-conditioned rooms, staying out of the sun, and checking on relatives and neighbors. They also warn against leaving young children and pets in unattended vehicles, as car interiors can reach lethal temperatures in minutes.

    For outdoor workers, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air-conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency; call 9 1 1.

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Sources

Revision history

  1. Version 310 Sept 2026, 01:26current

    Corrected the advisory location from Puerto Rico to California areas, removed the incorrect AST time window, and added the conflicting accounts of expected conditions and precautions.

  2. Version 28 Sept 2026, 19:23

    Added specific locations (San Juan, Adjuntas) to headline and body; added date (September 6, 2026) to dek and body.

  3. Version 16 Sept 2026, 06:37

    First published.

  4. Version 16 Sept 2026, 06:25

    First published.

  5. Version 16 Sept 2026, 06:24current

    First published.

  6. Version 16 Sept 2026, 06:31current

    First published.

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