FirstAlerts
Severe WeatherVersion 3

Heat Advisory Issued for Bay Area and Central Coast

The National Weather Service has issued a Heat Advisory for the Bay Area and Central Coast, with temperatures expected to reach 90-105 degrees in interior areas.

4 reports on this incident · first at Sep 7, 2026, 2:46 a.m. ET

By AI ReporterFirst reported Sep 7, 2026, 8:39 a.m. ETUpdated Sep 9, 2026, 3:53 p.m. ET
The has issued a for the Bay Area and Central Coast, according to reports from ktvu.com and yahoo.com. The covers cities including Concord, Livermore, Cloverdale, Sunnyvale, Morgan Hill, San Rafael, Walnut Creek, San Francisco, Santa Rosa, and San Jose. The was issued on September 7, 2026, according to an official record. The begins at a time reported differently by sources: nbcbayarea.com reports it begins at 10:00 a.m. on September 9, 2026, while ktvu.com reports it begins at 12:00 a.m. on September 9, 2026, and yahoo.com reports it begins . It ends at a time also reported differently: nbcbayarea.com and ktvu.com report it ends at 10:00 p.m. on September 10, 2026, while yahoo.com reports it ends . The covers zones, according to an official record. Temperatures are expected to range from 90-105 degrees in the interior, with the coast seeing mid-70s to low-90s, according to nbcbayarea.com. The heat wave has pushed temperatures 10 to 20 degrees above normal, and , according to yahoo.com. The advises all residents to limit outdoor activities during the afternoon, seek air conditioned spaces, and take lots of breaks, as reported by yahoo.com.

Earlier reports

  1. Sep 9, 2026, 3:24 p.m. ET

    Bay Area Heat Advisory Extended Through Thursday Evening

    The National Weather Service has extended a Heat Advisory for the Bay Area and Central Coast, now running through Thursday evening. The advisory, which was issued September 7, now ends at 10 p.m. Thursday, September 10, according to NBC Bay Area and KTVU. Yahoo News reports the advisory continues through Thursday evening. The advisory began at 10 a.m. Wednesday, September 9, per NBC Bay Area, though KTVU lists the start as midnight Wednesday, and Yahoo says it began Tuesday evening.

    The advisory covers 11 zones, including Concord, Livermore, Cloverdale, Sunnyvale, Morgan Hill, San Rafael, Walnut Creek, San Francisco, Santa Rosa, and San Jose. Temperatures are expected to range from 90 to 105 degrees in the interior, with the coast seeing mid-70s to low-90s, according to NBC Bay Area. Yahoo News reports the heat wave has pushed temperatures 10 to 20 degrees above normal.

    Officials advise residents to stay hydrated and limit outdoor activity, and to seek air conditioned spaces during the afternoon, according to NBC Bay Area and Yahoo News. The National Weather Service issued the advisory; NBC Bay Area attributes it to NWS Bay Area.

  2. Sep 8, 2026, 12:46 a.m. ET

    Heat Advisory Issued for San Juan and Vicinity, Northeast, Southeast Through Thursday

    On September 7, 2026, the National Weather Service issued a Heat Advisory for portions of Puerto Rico, effective from 10 AM AST Tuesday, September 8, through 5 PM AST Thursday, September 10. The advisory 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, according to ktvu.com.

    The advisory warns that this level of heat can affect anyone without effective cooling or adequate hydration. Heat-related illnesses increase significantly during periods of very high heat indices or high temperatures, with the most pronounced impacts across coastal sections, lowlands, interior valleys, and urban areas.

    Residents are advised to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check on relatives and neighbors. The National Weather Service emphasizes not leaving young children and pets in unattended vehicles, as car interiors can reach lethal temperatures in minutes. Anyone overcome by heat should be moved to a cool and shaded location, and heat stroke is an emergency requiring a call to 9 1 1.

  3. Sep 7, 2026, 2:46 a.m. ETFirst report

    Extreme Heat Warning for San Juan and Vicinity, Northeast, Southeast Until 5 PM AST

    The National Weather Service in San Juan has issued an Extreme Heat Warning for September 7, 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 Bayamon, Caguas, Mayaguez, and others.

    The warning ends at 5:00 PM AST this afternoon. It states that this level of heat can affect anyone without effective cooling or adequate hydration. Impacts include a significant increase in heat-related illnesses, with the most pronounced effects across coastal sections, lowlands, interior valleys, and urban areas. The NWS advises drinking plenty of fluids, staying in air-conditioned rooms, staying out of the sun, and checking on relatives and neighbors. It also warns against leaving young children and pets in unattended vehicles, as car interiors can reach lethal temperatures in minutes.

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

Was this report accurate and useful?

Sources

Revision history

  1. Version 39 Sept 2026, 19:53current

    Added nbcbayarea.com as a source for the advisory start time and temperature range; clarified the issuing office as National Weather Service.

  2. Version 29 Sept 2026, 17:56

    Corrected the story to reflect the actual Heat Advisory for the Bay Area and Central Coast, not the previous erroneous Extreme Heat Warning for Puerto Rico.

  3. Version 19 Sept 2026, 19:24current

    First published.

  4. Version 17 Sept 2026, 06:53

    First published.

  5. Version 17 Sept 2026, 06:46current

    First published.

  6. Version 18 Sept 2026, 04:46current

    First published.

How we work

This site models an investigative reporter rather than a wire desk. The aim is the most complete, accurate and timely account we can assemble — all three, not a trade between them. Reports go out within minutes of the coverage they are built from, carrying context a newsroom would otherwise need a day and a records request to gather: what has happened at this place before, what the operator’s record is, which aircraft it actually was.

Reports are built from primary sources — accident and court records, official registries, weather observations, agency statements — and from reputable news organisations, each named where their reporting is used. Facts are extracted before anything is written, and every one must be supported by a quotation found in the source itself; the model that writes the report is given only those verified facts and never sees the article, so it cannot introduce a detail no source stated.

Where sources disagree we publish the disagreement, attributed, rather than picking a figure. Where a fact comes from a record rather than a reporter, we say so, and the language matches: an instrument reading is never described as something anyone confirmed. Some things are deliberately withheld — a suspect is not named until an agency names them on the record, victims until families or officials release them — and corrections appear as visible revisions, never as silent edits.

None of that makes a report true. A quotation check proves a source said something, not that it was right, and an automated system can be confidently wrong in ways the checks do not catch. If something here is wrong, the feedback above is how it gets found. The full methodology, including what we refuse to publish.