An Extreme Heat Warning is in effect right now for a broad stretch of Southern California, covering the Coachella Valley, San Diego County Mountains, Orange County Inland, Santa Ana Mountains and Foothills, San Diego County Inland Valleys, and San Bernardino and Riverside County Valleys, including the Inland Empire. The warning was issued by the National Weather Service office in San Diego, California at 11:40 AM PDT on August 29, 2026, and remains active until 8:00 PM PDT on August 29, 2026. If you are in or near any of these areas and have not yet taken protective action, do so now.
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What NWS San Diego Is Telling You to Do Right Now
The National Weather Service San Diego office has issued specific, direct guidance for anyone in the affected areas. Follow each point as written:
Hydrate and get indoors. Drink plenty of fluids and stay in an air-conditioned room. If your home does not have air conditioning, identify a nearby cooling center, library, or shopping mall and go there. Staying out of the sun is not optional during an Extreme Heat Warning. This level of alert means conditions are dangerous enough to cause rapid heat illness in otherwise healthy people.
Check on relatives and neighbors. NWS San Diego specifically calls out the importance of checking on the people around you. Elderly residents, young children, and anyone with a chronic health condition are at heightened risk during extreme heat events. A brief phone call or a knock on the door can make a critical difference for someone who may not recognize they are in distress.
Never leave young children or pets in an unattended vehicle. The National Weather Service is explicit on this point: car interiors reach lethal temperatures in a matter of minutes. This is not a risk that can be managed by cracking a window or parking in the shade. If you are traveling with children or animals on August 29, 2026, while this warning is active, they must exit the vehicle with you every single time. There are no exceptions.
Stay out of the sun. The warning specifically includes avoiding sun exposure as a core protective action. Limit any time spent outdoors to the shortest duration necessary. If you must be outside, seek shade immediately and return indoors as quickly as possible.
Why This Fits a Broader Pattern Worth Preparing For
Heat warnings across Southern California are not isolated events. They are part of a recurring warm-season pattern that intersects with power demand, grid stress, and the conditions that precede and accompany wildfire risk. Over the past 60 days, fire has accounted for 35 of 55 federal disaster declarations nationally, with states including California, Washington, Oregon, Nevada, and Colorado among those most affected. Extreme heat and fire risk do not always arrive together, but they share the same landscape: dry conditions, high temperatures, and stressed infrastructure. At the federal level, grid reliability under heat demand is also a current concern, as reflected in recent Department of Energy actions to protect regional transmission capacity. Building a preparedness posture that accounts for heat, fire, and power disruption together, rather than treating each as a separate surprise, is the most practical approach for any household in the Southern California region. Use the time this warning is in effect to confirm your cooling plan, check your emergency water supply, and make sure the people in your household network know how to reach each other.
For the fundamentals that apply beyond this specific alert, see our Extreme Heat Preparedness guide.
Source: National Weather Service (NWS San Diego CA). Active alert data retrieved 2026-08-29 22:00 UTC via api.weather.gov.
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