Southern States Brace for Dangerous, Prolonged Heat Wave
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Southern States Brace for Dangerous, Prolonged Heat Wave
- A "heat dome" is expected to bring triple-digit temperatures and heat indices up to 120 degrees Fahrenheit to parts of the Southern U.S. starting Sunday, August 23, 2026.
- This prolonged heat event, which could break daily temperature records, is anticipated to impact over 30 million people, with little relief expected even after sunset as overnight temperatures remain above 80 degrees Fahrenheit.
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A dangerous and prolonged heat wave is forecast to impact the Southern United States, driven by a “heat dome” — a persistent area of high pressure that traps heat. The heat wave is expected to bring temperatures into the triple digits, with heat indices, which account for humidity, potentially reaching as high as 120 degrees Fahrenheit in some areas. The most intense heat is anticipated from southern Georgia to southeastern Virginia on Sunday, August 23, 2026, with Monday potentially being the harshest day, putting over 30 million people at extreme heat risk.
The National Weather Service has issued excessive heat warnings and advisories across the affected regions, urging residents to take precautions. This heat dome is predicted to have substantial staying power, with some models suggesting it could reach historic strength for this time of year, potentially surpassing the intensity of the heat dome experienced on June 29, 2012.
A significant concern is the lack of overnight relief, as temperatures are expected to remain above 80 degrees Fahrenheit for several consecutive nights across much of the South. This continuous heat can increase the risk of heat-related illnesses such as heat exhaustion and heat stroke, particularly for vulnerable populations including older adults, young children, and outdoor workers. Cities and communities are advising residents to limit strenuous outdoor activity, stay hydrated, and seek air-conditioned environments during the hottest parts of the day. The heat wave is projected to persist through at least early next week, with the heat dome potentially remaining over the Southern U.S. through the end of August.