Severe · Extreme Heat WarningActive alert

Extreme Heat Warning issued September 8 at 3:44AM PDT until September 9

Affecting San Bernardino and Riverside County Valleys-The Inland Empire

In effect until: Sep 8, 2026, 11:30 PM

San Bernardino and Riverside County Valleys-The Inland Empire

Likely impact; effects through 11:30 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 temperatures high temperatures in the upper 90s to 108 with
low temperatures in the 70s expected. For the Heat Advisory, high
temperatures in the mid 90s to 102 expected.

* WHERE...San Bernardino and Riverside County Valleys-The Inland
Empire.

* 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...Major HeatRisk through Wednesday. Warm
overnight temperatures 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 3:44AM PDT until September 9

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