An Extreme Heat Warning is currently in effect for several Southern California regions, issued by the National Weather Service and active from July 23, 2026 at 11:47 AM PDT through July 27, 2026 at 9:00 PM PDT. The warning covers Indian Wells Valley, Coachella Valley, San Bernardino and Riverside County Valleys (the Inland Empire), Apple and Lucerne Valleys, San Diego County Mountains, and the Antelope Valley. The alert was coordinated across three NWS offices: NWS Hanford CA, NWS San Diego CA, and NWS Los Angeles/Oxnard CA, reflecting the broad geographic scope of this heat event across the region.
What the National Weather Service Is Telling Residents Right Now
The National Weather Service is direct in its guidance: drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. These are not suggestions to weigh against convenience, during an Extreme Heat Warning, they are the primary actions that reduce risk of serious injury and death.
Do not leave young children or pets in unattended vehicles. NWS explicitly warns that car interiors can reach lethal temperatures within minutes, even with windows cracked or the vehicle parked in shade. This applies throughout the warning period, not only during peak afternoon hours.
For those who must spend time outdoors, NWS advises wearing lightweight and loose-fitting clothing and limiting strenuous physical activity to early morning or evening hours when temperatures are lower. Residents and workers should know the warning signs of heat exhaustion and heat stroke and take action immediately when those symptoms appear in themselves or others.
For outdoor workers specifically, NWS references Occupational Safety and Health Administration (OSHA) guidance recommending frequent rest breaks in shaded or air-conditioned environments. If anyone is overcome by heat, they should be moved to a cool, shaded location without delay. Heat stroke is a medical emergency, call 911 immediately if someone is unresponsive, confused, or stops sweating in extreme heat.
The NWS summary for this event is straightforward: Stay cool, stay hydrated, stay informed.
Preparedness Context for the Days Ahead
Multi-day extreme heat events like this one, spanning nearly four full days across geographically diverse terrain from valley floors to mountain communities, are precisely the scenarios that preparedness planning addresses. Residents in the affected areas are encouraged to identify their nearest public cooling center before they need it, ensure they have a reliable supply of water on hand, and establish a check-in routine with elderly neighbors, family members who live alone, or anyone without reliable access to air conditioning. The warning remains active through the evening of July 27; conditions may remain dangerous even after sunset on any given day during that window. For the latest updates, monitor your local NWS office directly at weather.gov and follow guidance from local emergency management authorities in your county.
For the fundamentals that apply beyond this specific alert, see our Power Outage Preparedness guide.
Source: National Weather Service (NWS Hanford CA, NWS San Diego CA, NWS Los Angeles/Oxnard CA), active alert data retrieved 2026-07-23 22:00 UTC via api.weather.gov.
