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Updated:October 1, 2026 12:01 pm PDT

Extreme Heat Warning EXTREME HEAT WARNING  
Riverside County
Effective: Thu, 10/1 12:29am Severity:  Severe 
Updated: October 1, 2026 12:01 pm Urgency: Expected
Expires: Thu, 10/1 3:30pm Certainty: Likely
Areas Affected: Santa Ana Mountains and Foothills
 
Alert Details: 
* WHAT...Dangerously hot conditions with high temperatures in the mid
90s to 104 expected. Night will be very warm with low temperatures
mostly in the mid 60s to mid 70s.

* WHERE...Santa Ana Mountains and Foothills.

* WHEN...From 10 AM Friday to 8 PM PDT Thursday.

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

Information: 
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.
Extreme Heat Warning EXTREME HEAT WARNING  
Riverside County
Effective: Thu, 10/1 12:29am Severity:  Severe 
Updated: October 1, 2026 12:01 pm Urgency: Expected
Expires: Thu, 10/1 3:30pm Certainty: Likely
Areas Affected: San Bernardino and Riverside County Valleys-The Inland Empire
 
Alert Details: 
* WHAT...Dangerously hot conditions with high temperatures in the
upper 90s to 106 expected. Nights will be very warm with low
temperatures mostly in the mid 60s to lower 70s.

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

* WHEN...From 10 AM Friday to 8 PM PDT Thursday.

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

Information: 
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.