Severe · Extreme Heat WarningActive alert

Extreme Heat Warning issued September 9 at 2:25PM PDT until September 10

Affecting San Bernardino and Riverside County Valleys-The Inland Empire

In effect until: Sep 10, 2026, 5:30 AM

San Bernardino and Riverside County Valleys-The Inland Empire

Likely impact; effects through 5:30 AM.

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 upper 90s to 106 on Thursday with
morning low temperatures in the 70s and lower 80s expected.

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

* WHEN...Until 8 PM PDT Thursday.

* IMPACTS...Heat related illnesses increase significantly during
extreme heat events.

* ADDITIONAL DETAILS...Major HeatRisk through today. Moderate to
major HeatRisk on Thursday. Warm overnight temperatures will limit
relief from the heat.

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

Extreme Heat Warning issued September 9 at 2:25PM PDT until September 10

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