National

Heat wave disrupts Fourth of July events across eastern US

By Ahmed Aboulenein and Nathan Layne Reuters

Updated July 3, 2026 4:50 PM

A person uses an umbrella to block the sun at the Supreme Court amid a heatwave in Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon — A person uses an umbrella to block the sun at the Supreme Court amid a heatwave in Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon Annabelle Gordon Reuters

tag:reuters.com,2026:binary_LOA496103072026RP1-PREVIEW:48000:MP3 mpeg

tag:reuters.com,2026:binary_LOA496103072026RP1-STREAM:22.050:MP3 mpeg

tag:reuters.com,2026:binary_LOA496103072026RP1-STREAM:48000:M4A aac

tag:reuters.com,2026:binary_LOA496103072026RP1-STREAM:48000:MP3 mpeg

tag:reuters.com,2026:binary_LOA496103072026RP1-STREAM:48000:WAV wav

tag:reuters.com,2026:binary_LOA496103072026RP1-STREAM:48000M:WAV wav

tag:reuters.com,2026:binary_LOA497403072026RP1-PREVIEW:48000:MP3 mpeg

tag:reuters.com,2026:binary_LOA497403072026RP1-STREAM:22.050:MP3 mpeg

tag:reuters.com,2026:binary_LOA497403072026RP1-STREAM:48000:M4A aac

tag:reuters.com,2026:binary_LOA497403072026RP1-STREAM:48000:MP3 mpeg

tag:reuters.com,2026:binary_LOA497403072026RP1-STREAM:48000:WAV wav

tag:reuters.com,2026:binary_LOA497403072026RP1-STREAM:48000M:WAV wav

tag:reuters.com,2026:binary_LOP496103072026RP1-BASEIMAGE:960X540 jpegBaseline

tag:reuters.com,2026:binary_LOP496103072026RP1-THUMBNAIL:160X90 jpegBaseline

tag:reuters.com,2026:binary_LOP496103072026RP1-THUMBNAILGRID jpegBaseline

tag:reuters.com,2026:binary_LOP496103072026RP1-VIEWIMAGE:512X288 jpegBaseline

tag:reuters.com,2026:binary_LOP497403072026RP1-BASEIMAGE:960X540 jpegBaseline

tag:reuters.com,2026:binary_LOP497403072026RP1-THUMBNAIL:160X90 jpegBaseline

tag:reuters.com,2026:binary_LOP497403072026RP1-THUMBNAILGRID jpegBaseline

tag:reuters.com,2026:binary_LOP497403072026RP1-VIEWIMAGE:512X288 jpegBaseline

tag:reuters.com,2026:binary_LOV496103072026RP1-STREAM:1756:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV496103072026RP1-STREAM:2000:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV496103072026RP1-STREAM:5128:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV496103072026RP1-STREAM:6756:16X9:MPG mpeg

tag:reuters.com,2026:binary_LOV496103072026RP1-STREAM:700:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV496103072026RP1-STREAM:8256:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV496103072026RP1-STREAM:8256M:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV496103072026RP1-STREAM:CLOSEDCAPTION:SRT srt

tag:reuters.com,2026:binary_LOV496103072026RP1-STREAM:CLOSEDCAPTION:VTT vtt

tag:reuters.com,2026:binary_LOV496103072026RP1-STREAM:SHOTLIST:JSON json

tag:reuters.com,2026:binary_LOV497403072026RP1-STREAM:1756:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV497403072026RP1-STREAM:2000:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV497403072026RP1-STREAM:5128:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV497403072026RP1-STREAM:6756:16X9:MPG mpeg

tag:reuters.com,2026:binary_LOV497403072026RP1-STREAM:700:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV497403072026RP1-STREAM:8256:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV497403072026RP1-STREAM:8256M:16X9:MP4 H264/mpeg

tag:reuters.com,2026:binary_LOV497403072026RP1-STREAM:CLOSEDCAPTION:SRT srt

tag:reuters.com,2026:binary_LOV497403072026RP1-STREAM:CLOSEDCAPTION:VTT vtt

tag:reuters.com,2026:binary_LOV497403072026RP1-STREAM:SHOTLIST:JSON json

tag:reuters.com,2026:binary_LWD496103072026RP1-STREAM:13756:16X9:HD1080I50:MP4 mp4

tag:reuters.com,2026:binary_LWD496103072026RP1-STREAM:13756:16X9:HD1080I60:MP4 mp4

tag:reuters.com,2026:binary_LWD496103072026RP1-STREAM:1756:16X9:MP4 mp4

tag:reuters.com,2026:binary_LWD496103072026RP1-STREAM:2128:16X9:MP4 mp4

tag:reuters.com,2026:binary_LWD496103072026RP1-STREAM:6756:16X9:SD525I30:MPG mpeg

tag:reuters.com,2026:binary_LWD496103072026RP1-STREAM:6756:16X9:SD625I25:MPG mpeg

tag:reuters.com,2026:binary_LWD496103072026RP1-THUMBNAILGRID jpegBaseline

tag:reuters.com,2026:binary_LWD496103072026RP1-VIEWIMAGE:768X432 jpegBaseline

tag:reuters.com,2026:binary_LWD497403072026RP1-STREAM:13756:16X9:HD1080I50:MP4 mp4

tag:reuters.com,2026:binary_LWD497403072026RP1-STREAM:13756:16X9:HD1080I60:MP4 mp4

tag:reuters.com,2026:binary_LWD497403072026RP1-STREAM:1756:16X9:MP4 mp4

tag:reuters.com,2026:binary_LWD497403072026RP1-STREAM:2128:16X9:MP4 mp4

tag:reuters.com,2026:binary_LWD497403072026RP1-STREAM:6756:16X9:SD525I30:MPG mpeg

tag:reuters.com,2026:binary_LWD497403072026RP1-STREAM:6756:16X9:SD625I25:MPG mpeg

tag:reuters.com,2026:binary_LWD497403072026RP1-THUMBNAILGRID jpegBaseline

tag:reuters.com,2026:binary_LWD497403072026RP1-VIEWIMAGE:768X432 jpegBaseline

WASHINGTON - A dangerous heat wave upended Fourth of July celebrations across swaths of the central and eastern U.S. on Friday, forcing officials in the nation's capital and elsewhere to cancel or postpone dozens of parades, concerts and fireworks displays.

Among the events disrupted by the sweltering heat was the Great American State Fair on the National Mall in Washington, a centerpiece of President Donald Trump's efforts to mark the nation's 250th birthday.

The fair was temporarily closed on Friday afternoon as temperatures reached 101 degrees Fahrenheit (38 degrees Celsius). Organizers said they expected it to reopen at 5 p.m., with modifications like cooling tents and misting stations.

Record-breaking temperatures spread to the eastern U.S. from the Midwest earlier this week due to the emergence of a high-pressure system known as a "heat dome," which traps a mass of hot air over a region and can cause humidity to spike.

Over 185 million people, more than half the U.S. population, were under heat alerts on Friday, the National Weather Service said. Peak heat indexes could reach 115 F (46 C) in parts of the country.

Forecasters and government officials have warned that the heat wave could prove deadly. They urged Americans celebrating the Fourth of July weekend outdoors to stay hydrated, seek shade and watch for signs of heat illness at gatherings and public events.

Event cancellations were reported across the Eastern Seaboard for the July 4 weekend, when Americans typically gather for barbecues, parades and fireworks displays to celebrate the nation's 1776 Declaration of Independence from Britain.

In Philadelphia, officials canceled the Salute to Independence Parade, a marquee event in the city's semiquincentennial celebrations, citing extreme heat. The decision came after temperatures hit 103 F on Thursday, tying a record high last seen in 1901.

Elsewhere, heat-related disruptions rippled across the region. Haddon Township, New Jersey, canceled its annual July 4 parade, while Watertown in upstate New York called off its Independence Day concert and fireworks display. In Boston, officials delayed entry to an annual riverside fireworks celebration by four hours, to 4 p.m. instead of noon.

(Reporting by Ahmed Aboulenein in Washington and Nathan Layne in New York; Editing by Mark Porter and David Gregorio)

A person descending the stairs of the Lincoln Memorial covers her face with her hand amid a heatwave in Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon — A person descending the stairs of the Lincoln Memorial covers her face with her hand amid a heatwave in Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon Annabelle Gordon Reuters

Tourists use an umbrella to block the sun as excessive heat hits Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon — Tourists use an umbrella to block the sun as excessive heat hits Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon Annabelle Gordon Reuters

Visitors of the Lincoln Memorial fan themselves amid a heatwave in Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon — Visitors of the Lincoln Memorial fan themselves amid a heatwave in Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon Annabelle Gordon Reuters

A girl splashes water onto herself at the World War II Memorial amid a heatwave in Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon — A girl splashes water onto herself at the World War II Memorial amid a heatwave in Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon Annabelle Gordon Reuters

A woman sits in the shade and fans herself at the base of the Washington Monument due to excessive heat in Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon — A woman sits in the shade and fans herself at the base of the Washington Monument due to excessive heat in Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon Annabelle Gordon Reuters

A man lies down under trees as excessive heat hits Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon — A man lies down under trees as excessive heat hits Washington, D.C., U.S., July 1, 2026. REUTERS/Annabelle Gordon Annabelle Gordon Reuters

Copyright Reuters or USA Today Network via Reuters Connect.

This story was originally published July 3, 2026 at 4:12 PM.