A historic heat wave has forced the cancellation or postponement of dozens of Fourth of July celebrations across the eastern United States, disrupting the nation’s 250th anniversary festivities just as President Donald Trump prepared to stage what he called “the most spectacular TRUMP RALLY of them all” in Washington, DC. Temperatures soared past 40°C in cities from New York to Philadelphia, straining power grids and sending hundreds to medical tents for heat-related illnesses, while parades, concerts and fireworks displays were scrapped to protect public safety.
In Washington, DC, organizers canceled the traditional Independence Day parade after a heat advisory warned that outdoor exposure could pose “serious health risks.” The Great American State Fair on the National Mall, a centerpiece of the semiquincentennial celebrations, was shut for several hours on Friday after at least a dozen attendees required treatment for heat exhaustion, according to the DC Fire and Emergency Medical Services Department . The fair reopened late Friday afternoon but remained under close watch as temperatures hovered near 38°C.
Across the country, the cancellations extended from New Jersey and Maryland to Colorado, where organizers in Philadelphia scrapped the “Salute to Independence Semiquincentennial” parade, once billed as one of the largest in the nation . In Watertown, New York, a planned concert was also called off, and multiple outdoor World Cup matches were delayed as the heat wave intensified. The National Weather Service reported that more than 165 million Americans were under heat advisories on Friday, with Newark, New Jersey, recording 40.5°C—its highest temperature since records began 154 years ago .
Despite the cancellations, Trump pressed ahead with his own celebration, delivering a combative speech late Friday at Mount Rushmore that framed the anniversary as a defense of American identity against “new threats,” including what he described as a resurgence of “the communist threat.” Speaking to a crowd in near-41°C heat, he vowed to attend Saturday’s rally in Washington regardless of conditions, telling reporters, “It will be about 107 degrees out, and I’m going to give a very long speech—just to show I can do anything” . His event is expected to feature military flyovers and a fireworks display he has billed as “the biggest in the world.”
The heat wave has also exacerbated strains on energy infrastructure, with utilities warning of potential blackouts as air conditioning demand surges. In Portugal, meanwhile, firefighters continued to battle a massive wildfire near Setúbal that injured 10 people—eight firefighters and two civilians—and forced the evacuation of 25 homes, while a separate blaze in Viseu, central Portugal, has burned for two days, involving more than 1,100 personnel . The fires come as France recorded its hottest June on record, with heat-related deaths rising sharply .
Public health officials urged Americans to limit outdoor exposure, stay hydrated and check on vulnerable neighbors as the heat wave shows no signs of abating. In Washington, Mayor Zohran Mamdani criticized the federal response, saying in a speech that immigrants—long a target of Trump’s rhetoric—are “essential to this country” and have been “left to suffer” under the extreme conditions . The mayor’s remarks underscored the political fault lines intersecting with the climate crisis as the nation marks its semiquincentennial.
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