Severe · Extreme Heat WarningActive alert
Extreme Heat Warning issued September 9 at 2:58AM PDT until September 9
Affecting San Bernardino and Riverside County Valleys-The Inland Empire
In effect until: Sep 9, 2026, 10:30 PM
San Bernardino and Riverside County Valleys-The Inland Empire
Likely impact; effects through 10:30 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.
Read the original bulletin (official text)
* WHAT...For the Extreme Heat Warning, dangerously hot conditions with high temperatures of 104 to 110 with low temperatures in the 70s and lower 80s expected. For the Heat Advisory, high temperatures in the upper 90s to 105 expected. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...For the Extreme Heat Warning, until 8 PM PDT this evening. For the Heat Advisory, from 8 PM this evening to 8 PM PDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Major HeatRisk through today. Warm overnight temperatures will limit relief from the heat.
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Alert data: U.S. National Weather Service / NOAA · Translation: WeatherTranslate™