A monolithic heat dome is settling implicit the eastbound fractional of the country, triggering the archetypal large vigor question of the summer, conscionable up of the July 4 holiday.
While temperatures whitethorn highest earlier July 4 itself, much than 44 cardinal radical crossed the state volition inactive acquisition triple-digit aerial temperatures oregon vigor scale values arsenic they observe America's 250th birthday.
WHAT IS A HEAT DOME AND HOW CAN IT AFFECT YOU DURING THE SUMMER MONTHS?
More than 20 states are expected to scope 100 degrees this week and implicit 230 cardinal radical volition surpass 90 degrees, with much than 140 municipalities expected to spot record-high temperatures.

WASHINGTON, DC - JUNE 28: Visitors basal successful enactment to thrust the 110-foot "Freedom 250" ferris instrumentality connected the 4th time of the "Great American State Fair" connected the National Mall connected June 28, 2026 successful Washington, DC.
((Photo by Al Drago/Getty Images) / Getty Images)
Some wore sweaters successful Washington, D.C., for the opening play of the Great American State Fair connected the National Mall. But those attending connected July 4 volition request plentifulness of sunscreen and water.
EXTREME HEAT SAFETY: RECOGNIZING SIGNS OF HEAT ILLNESS AND HOW TO TREAT IT
While it volition consciousness similar a godforsaken crossed overmuch of the Central and Eastern U.S. connected Independence Day, the Desert Southwest volition inactive officially clasp the hottest July 4 temperatures this weekend.
Bullhead City, Arizona: 107 degrees
Bullhead City and Lake Havasu City, Arizona, on with a fewer California municipalities are expected to beryllium the hottest cities this July 4, with temperatures reaching a scorching precocious of 107 degrees.
Fortunately, determination should beryllium immoderate alleviation from the vigor astatine nighttime on the Colorado River, wherever Bullhead City is expected to big its 36th yearly Independence Day fireworks show.
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Phoenix, Goodyear and Luke, Arizona, will not beryllium acold down with an expected precocious somesthesia of 106 degrees.

FILE - The Colorado River flows past Laughlin, Nevada, left, and Bullhead City, Arizona, connected May 12, 2023.
((Sam Morris/Las Vegas Review-Journal/Tribune News Service via Getty Images) / Getty Images)
Calexico, California: 107 degrees
Calexico, Blythe and Needles, California, are besides forecast to scope 107 degrees, successful Imperial, Riverside and San Bernardino counties respectively.
The Calexico Recreation Department is helping families chill disconnected and observe America 250 with a household nighttime astatine the section aquatic center.
EXTREME HEAT SAFETY: HOW TO PREPARE AND STAY COOL DURING A HEAT WAVE
Imperial and Thermal, California, are acceptable to scope 106 degrees connected the Fourth.

FILE - CALEXICO, CA - AUGUST 31: A radical of men beryllium underneath a histrion for shadiness amid a heatwave connected August 31, 2022 successful Calexico, California.
(Photo by Ariana Drehsler/Getty Images) / Getty Images)
Oklahoma City, Oklahoma: 100 degrees
Intense vigor volition stay crossed overmuch of the Southern Plains done the vacation weekend, with Oklahoma City forecast to scope the period people connected July 4.
OKC volition beryllium holding Independence Day celebrations astatine OKANA Indoor Waterpark & Resort successful summation to the city's fireworks show.

FILE - OKLAHOMA CITY, OKLAHOMA - JUNE 4: Oklahome City skyline connected June 4, 2026.
((Photo by Chris Swann/NCAA Photos via Getty Images) / Getty Images)
Dallas, Texas: 100 degrees
Dallas is forecast to articulation Oklahoma City with triple-digit temperatures connected July 4th.
Those attending America 250 celebrations downtown oregon lining up for the historical Lakewood Fourth of July Parade and festival should beryllium definite to battalion plentifulness of water.

FILE - GAINESVILLE, TEXAS - JUNE 29: Blake McCoy of Gainesville, Texas and his fiancee Stephany Robles beryllium unneurotic during Klyde Warren Park's Independence Day Celebration, Saturday, June 29, 2024, successful Dallas.
(Chitose Suzuki/The Dallas Morning News via Getty Images) / Getty Images)
Philadelphia, Pennsylvania: 100 degrees
Philadelphia has already opened cooling stations up of July 4, wherever it is forecast to deed 100 degrees.
The metropolis is simply a centerpiece for America 250 celebrations, featuring a greeting ceremonial astatine Independence Hall and a monolithic performance connected the Benjamin Franklin Parkway opening astatine 5 p.m.
In addition, day thunderstorms could supply immoderate vigor relief, but could beryllium beardown capable to disrupt outdoor activities.

PHILADELPHIA, PENNSYLVANIA - JULY 4: Fans are seen successful the stadium earlier a crippled betwixt the Philadelphia Phillies and the Cincinnati Reds astatine Citizens Bank Park connected July 4, 2025 successful Philadelphia, Pennsylvania.
((Photo by Hunter Martin/Getty Images) / Getty Images)
Washington, D.C.: 99 degrees
The nation's superior is presently forecast to enactment conscionable nether the period mark, but day thunderstorms are besides possible.
Those visiting the Great American State Fair oregon attending the National Independence Day Parade successful the morning, oregon the Capitol Fourth Concert successful the evening, should show the forecast passim the week.

WASHINGTON, DC - AUGUST 28: Visitors locomotion astir the fountain of the World War II Memorial connected August 28, 2024 successful Washington, DC.
((Photo by Anna Moneymaker/Getty Images) / Getty Images)
New York City: 96 degrees
While New York City is expected to spot back-to-back days of 100 degrees for the archetypal clip since 2011, July 4 itself volition beryllium somewhat cooler, with thunderstorms imaginable up of the dual milestone of the 50th Annual Macy's 4th of July Fireworks and America 250.

FILE - NEW YORK, NY - JULY 04: A wide overview of the 39th yearly Macy's 4th of July fireworks connected July 4, 2015 successful New York City.
((Photo by Brad Barket/Getty Images) / Getty Images)

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