From Florida to Arizona, Cities Where It Will Likely Be 100 Degrees All Week

Temperatures have topped 100 degrees across much of the United States this spring and summer. In March, a ridge of high pressure created a heat dome in the West. According to Climate Central, more than 1,500 daily record highs were set across the U.S. between March 16 and 23. Earlier that month, NOAA had identified an overlapping set of cities, some of which fell outside Climate Central’s analysis. In early May, NPR reported that March 2025 was the hottest March recorded in the contiguous U.S. in 132 years, and noted that climate change is driving up temperatures and making intense wildfires more likely.

A few weeks later, the heat moved east. On July 2, New York City set its own record: the last time Central Park had reached 100 degrees was July 18, 2012, according to The New York Times. Temperature records fell from Boston to Philadelphia to Washington, and as far inland as Albany. In New York City, heavy air conditioning use prompted utilities to warn of possible electricity shortages.

Four major heat domes have struck this year, each affecting more than 100 million people at a time. A heat dome is not an official scientific term but has become a favorite of the press; it refers to an oppressive high-pressure system that pushes warm air to the surface and holds it there for an extended period.

The heat has brought a range of harmful effects. Chief among them are health dangers that lead to illness, emergency room visits, and even death. Electricity costs have also soared due to heavy air conditioning use, and among the poorest residents, some cannot afford to pay their bills. A research paper on disparities in access to air conditioning found that those with no access were almost always low-income.

In many parts of the country, heat has gone hand in hand with wildfires. The National Interagency Fire Center puts this year’s total at 50,784 wildfires and 7,818,359 acres burned — both decade-high records for this point in the year. A UC Merced study found that intense heat drives significant increases in the area burned by wildfires, as meteorological conditions and dry fuel promote new ignitions and worsen ongoing fire activity. In most regions, the study found, these effects persist even after a heat wave ends.

The effects of these fires extend well beyond the fire zones themselves. Smoke from wildfires in Canada and the American West drifted into a corridor stretching from upper Michigan to New York City. On July 17, Detroit recorded the worst air quality of any major city in the world.

This week, the geographic reach of 100-degree heat may be the widest of the summer. Temperatures are expected to hit 100 degrees every day from Key West to Mississippi to most of Texas and Arizona, with Phoenix forecast to reach 113 degrees on one day. The city has already logged 100 days of 100-degree temperatures this year.

City	Week’s Highest Forecast	All-Time Record High	Population (approx.)
Lafayette, La.	113	110	121,000
Baton Rouge, La.	112	105	220,000
Phoenix, Ariz.	113	122	1,650,000
Tempe, Ariz.	113	~122	182,000
Arlington, Texas	109	113	394,000
Irving, Texas	109	113	256,000
McKinney, Texas	109	113	207,000
Shreveport, La.	109	113	183,000
Houston, Texas	108	109	2,300,000
Dallas, Texas	108	113	1,300,000
Fort Worth, Texas	108	113	935,000
New Orleans, La.	108	102	365,000
Plano, Texas	108	113	285,000
Grand Prairie, Texas	108	113	196,000
Tallahassee, Fla.	108	105	200,000
Mobile, Ala.	108	105	185,000
Tucson, Ariz.	108	117	545,000
Laredo, Texas	110	119	256,000
Garland, Texas	107	113	246,000
Frisco, Texas	107	113	215,000
Biloxi, Miss.	107	102	46,000
Austin, Texas	108	112	975,000
Brownsville, Texas	108	106	187,000
Miami, Fla.	107	100	442,000
Corpus Christi, Texas	110	109	317,000
Hialeah, Fla.	107	~100	223,000
Fort Lauderdale, Fla.	108	100	182,000
Jackson, Miss.	108	107	145,000
Gulfport, Miss.	105	~105	72,000
Killeen, Texas	106	~114	153,000
Tampa, Fla.	103	99	395,000
Orlando, Fla.	105	103	316,000
San Antonio, Texas	105	111	1,470,000
St. Petersburg, Fla.	105	~100	261,000
Key West, Fla.	105	97	25,000

Temperature forecasts are from the National Weather Service/NOAA, The Weather Channel, Weather.com, and AccuWeather. Population data is from the 2024 US Census.