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Severe · Extreme Heat WarningActive alert

Extreme Heat Warning issued September 8 at 1:52PM PDT until September 9

Affecting Santa Ana Mountains and Foothills

In effect until: Sep 9, 2026, 5:30 AM

Santa Ana Mountains and Foothills

Likely impact; effects through 5:30 AM.

Stay in air conditioning if possible. Drink water regularly and check on elderly neighbors.

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Read the original bulletin (official text)
* WHAT...For the Extreme Heat Warning, dangerously hot conditions
with high temperatures in the 90s to near 100 with low temperatures
in the 70s expected. For the Heat Advisory, high temperatures in
the mid 80s to low 90s expected.

* WHERE...Santa Ana Mountains and Foothills.

* WHEN...For the Extreme Heat Warning, until 8 PM PDT Wednesday. For
the Heat Advisory, from 8 PM Wednesday to 8 PM PDT Thursday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.

* ADDITIONAL DETAILS...Areas of Major HeatRisk. Very warm overnight
temperatures will limit relief from the heat.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™