A sprawling heat wave will blanket much of the central and eastern United States over the coming week, with temperatures soaring well above normal and humidity levels that will make conditions feel even more extreme. The National Weather Service warned Sunday that parts of the country are already experiencing dangerous heat, with the situation expected to intensify as the Fourth of July approaches.
More than 130 million Americans across southern and Great Plains states face moderate to severe heat risk, a zone that forecasters say will expand and intensify throughout the week. Parts of the Southwest and Texas were already posting temperatures around 100 degrees Fahrenheit on Sunday, and that heat is moving east.
The core of the heat wave will settle across the lower Great Lakes, mid-Atlantic, and Mississippi and Ohio River valleys, with several days of temperatures topping 100 degrees expected in many areas. Some cities could see record highs by later in the week, according to National Weather Service meteorologist Bryan Putnam.
Major metropolitan areas will be hit hard just as they prepare for World Cup matches and Independence Day celebrations. New York City, Philadelphia, Washington, Baltimore, Chicago, Indianapolis, St. Louis, and Detroit will all experience their highest temperatures in months. Southern cities including Dallas, Little Rock, and Memphis will also face intense heat. The Southeast and mid-Atlantic will remain scorching into next weekend.
The real danger lies in the combination of heat and humidity. While temperatures will reach into the 90s and low 100s, humidity will drive heat indexes to 100 to 110 degrees, with some areas possibly reaching 115 degrees. This kind of heat is dangerous for everyone, not just vulnerable populations, Putnam said.
"That's heat that's impactful to anyone," Putnam explained. "It's not just older adults or younger children or people who are spending a ton of time outdoors, maybe straining themselves a little more than normal. This is heat that really could impact everyone, especially with people outdoors going into the holiday weekend."
An AccuWeather meteorologist noted that temperatures will run 10 to 11 degrees above normal for early July. In Washington, DC, where Fourth of July highs typically average around 89 degrees, readings will be significantly hotter. Indianapolis, which normally sees summer highs around 85 degrees, will also be well above average.
A high pressure system is anchoring itself over the region, forcing storms to skirt around it and bringing little relief through rainfall. Meteorologists call this phenomenon a "heat dome." Nighttime lows in the 70s and even high 80s will provide minimal cooling, making sleep difficult for those without air conditioning. In coastal cities like New York, where nighttime temperatures could stay in the 80s, conditions will be particularly brutal after dark.
This heat pattern is especially dangerous because human bodies struggle to recover when nighttime temperatures remain elevated. Heat-related illnesses spike during these extended periods, health officials warn. The weather service recommends limiting outdoor activity, staying hydrated, and seeking out air-conditioned spaces whenever possible.
The extreme conditions are compounding wildfires raging across the western United States. Dry, windy weather near the Colorado-Utah border fueled a fast-moving fire that killed three firefighters from the US Wildland Fire Service and US Forest Service on Sunday, with two others suffering burn injuries. Wildfire activity has intensified across Utah, Colorado, Arizona, and surrounding areas as hot, dry, and windy conditions persist.
Author James Rodriguez: "A heat dome of this scale, arriving right before the holiday weekend when millions will be outside, is a legitimate public health emergency that shouldn't be overshadowed by fireworks and festivities."
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