An Extreme Heat Warning is currently in effect for multiple areas across Southern California, issued jointly by the National Weather Service offices in San Diego, Hanford, and Los Angeles/Oxnard. The warning covers a broad swath of inland and desert communities, including the San Bernardino and Riverside County Valleys (the Inland Empire), Apple and Lucerne Valleys, the Coachella Valley, the San Diego County Mountains, Indian Wells Valley, and the Antelope Valley. The warning took effect on Thursday, July 24, 2026, at 1:25 PM PDT and remains active through Monday, July 27, 2026, at 8:00 PM PDT. Residents in and traveling through these areas should treat this alert as active and ongoing for the full duration of that window.
What NWS Is Telling Residents to Do Right Now
The National Weather Service is issuing clear, direct guidance for everyone living in or moving through the warned areas. Officials are urging residents to drink plenty of fluids, even before you feel thirsty, and to stay in an air-conditioned room as much as possible during the period the warning is active. The NWS is also telling the public to stay out of the sun, reducing the risk of heat exhaustion and heat stroke that can develop quickly under extreme heat conditions. Critically, the agency is asking people to check up on relatives and neighbors, particularly those who may be elderly, live alone, or lack reliable access to air conditioning. That social check-in piece is an explicit part of the official guidance, a recognition that extreme heat becomes most dangerous for people who are isolated or without cooling resources.
If you are in one of the named communities, whether that is the Coachella Valley, the Antelope Valley, Indian Wells Valley, or the Inland Empire, the NWS guidance applies to you directly. Do not assume proximity to a cooler coastal area changes conditions in these inland and desert zones. The warning boundaries were drawn specifically because of the elevated risk those regions face.
Putting This Warning in Context
Extreme Heat Warnings represent the highest tier of heat-related alerts issued by the National Weather Service, they are not issued routinely or as a precaution. For disaster-preparedness purposes, a warning of this duration, spanning from the afternoon of July 24 through the evening of July 27, means affected households should treat cooling access as a priority need for several consecutive days, not just a single afternoon. USRiskRadar’s ongoing guidance on heat preparedness emphasizes identifying your nearest public cooling center in advance, keeping emergency water supplies accessible, and establishing a regular check-in schedule with vulnerable neighbors or family members, all of which align directly with what NWS San Diego is asking of the public right now. If your home loses air conditioning at any point during the warning period, treat that as an emergency situation and seek a cooled public space immediately.
This article will be updated if the National Weather Service modifies, extends, or cancels this warning. For the most current alert status, visit the official NWS page for your specific zone or check the NWS offices in San Diego, Hanford, or Los Angeles/Oxnard directly. The warning remains in effect through July 27, 2026, at 8:00 PM PDT.
For the fundamentals that apply beyond this specific alert, see our Power Outage Preparedness guide.
Source: National Weather Service (NWS San Diego CA, NWS Hanford CA, NWS Los Angeles/Oxnard CA), active alert data retrieved 2026-07-24 22:00 UTC via api.weather.gov.
