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By Anna Skinner
Associate News Editor
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Approximately 9 million people across Southwest California were urged to stay indoors as a dangerous early‑season heat wave triggered an 82‑hour extreme heat warning across the region, threatening record‑setting and potentially fatal temperatures across Los Angeles and Ventura counties.
The severe warning comes days after National Weather Service (NWS) offices across the region issued extreme heat watches late last week, marking the earliest such alert ever issued for Tucson and Phoenix, Arizona.
The new extreme heat warning was issued by NWS Los Angeles and goes into effect at 10 a.m. local time Tuesday morning. It will remain in place through 8 p.m. Friday night, marking an 82-hour period were meteorologists urged people to remain indoors as significant heat creates a dangerous environment outside.
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"A very strong high pressure system is moving from the eastern Pacific into the Desert Southwest early this week and will linger over the Southwest throughout the rest of the week. This will bring very warm weather to this part of the country through the week, with daily and even monthly record high temperatures in jeopardy in cities such as Los Angeles and Phoenix," AccuWeather meteorologist Kai Kerkow told Newsweek.
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Los Angeles Extreme Heat Warning
The NWS warned that temperatures in affected areas, including the San Fernando Valley, Santa Clarita Valley, San Gabriel Valley, and inland Los Angeles communities, are forecast to reach 96 to 104 degrees, with warm overnight lows that will prevent any meaningful relief. The agency said the prolonged heat will pose a high risk of heat illness, especially for older adults, young children, those without air conditioning, and people active outdoors.
Residents were advised to stay out of the sun, remain in air-conditioned spaces, drink plenty of fluids, and check on vulnerable neighbors. Officials urged limiting strenuous outdoor activity to early morning or evening hours.
San Diego, California, Extreme Heat Watch: Skyrocketing Temperatures to Hit 114 Degrees
Meanwhile, an extreme heat watch was issued by NWS San Diego for Coachella Valley, San Diego County Deserts, and San Gorgonio Pass near Banning, where temperatures were expected to surge well into the triple digits, ranging from 106 to 114 degrees between Thursday morning and Friday evening this week.
"Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes," NWS San Diego said in the extreme heat watch.
Meteorologists say this early‑season spike could break additional temperature records normally associated with June or July, underscoring a warming trend that has prompted urgent warnings from public health and emergency officials across multiple states.
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