Severe · Extreme Heat WarningActive alert

Extreme Heat Warning issued September 8 at 7:01AM PDT until September 9

Affecting San Diego County Inland Valleys

In effect until: Sep 8, 2026, 10:15 PM

San Diego County Inland Valleys

Likely impact; effects through 10:15 PM.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.

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Read the original bulletin (official text)

* WHAT...For the Extreme Heat Warning, dangerously hot conditions
with high temperatures in the mid 90s to 105 with low temperatures
in the 70s expected. For the Heat Advisory, high temperatures in
the 90s to 102 expected.

* WHERE...San Diego County Valleys.

* 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...Moderate to major HeatRisk. Elevated lows will
limit overnight relief from the heat.

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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™

Extreme Heat Warning issued September 8 at 7:01AM PDT until September 9

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