Environment & Climate

California heatwave triggers alerts for 37 million people as records fall

Temperatures reaching up to 20 degrees above normal prompted weeklong National Weather Service advisories.

Updated Oct 7, 2026 · 00:37 UTC5 reports

The short version

A multi-day October heatwave placed at least 37 million people across California under weather alerts.[ABC News]
At least eight Southern California cities broke daily high-temperature records on Saturday, with Vista reaching 108 degrees Fahrenheit to tie its all-time record.[ABC News]
The National Weather Service expects unseasonably high temperatures running 15 to 20 degrees above normal to persist for at least a week.[The Guardian]

At least 37 million residents across California were placed under heat alerts on Sunday during a prolonged October heatwave.[ABC News]
The National Weather Service issued multi-day advisories forecasting that unseasonably high heat will linger for at least a week.[The Guardian]
A meteorologist with the National Weather Service Weather Prediction Center noted that temperatures are projected to run 15 to 20 degrees above normal.[The Guardian]
On Saturday, at least eight Southern California cities broke daily high-temperature records, including Anaheim and San Diego reaching 105 degrees and Santa Ana hitting 107 degrees.[ABC News]
Vista reached 108 degrees on Saturday, which tied its all-time high temperature set in June 1985.[ABC News]

Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.