Dangerous Heatwave Grips Eastern US as Millions Face Record Temperatures Over Fourth of July Weekend
Millions of people across the eastern United States are experiencing dangerous and record-breaking temperatures as the Fourth of July holiday weekend begins, with weather officials warning that the extreme heat could pose serious health risks and disrupt outdoor celebrations.
The heatwave, described as the most intense of the year so far, is expected to affect nearly 25 million people across central and eastern parts of the country. Temperatures have climbed to levels not seen in decades in some areas, prompting authorities to urge residents to stay hydrated, avoid prolonged outdoor activities, and take precautions against heat-related illnesses.
New York City recorded a temperature of 100°F (38°C) on Thursday, marking its hottest day since 2012. The city could experience another day of triple-digit temperatures on Friday. Philadelphia also saw extreme conditions, reaching 103°F (39°C), its highest recorded temperature since 2011.
In Washington, D.C., temperatures are forecast to remain at or above 100°F for four consecutive days, a rare event that has occurred only twice before in the city’s recorded history.
The intense heat arrives as Americans celebrate Independence Day with barbecues, community parades, fireworks, and other outdoor gatherings. Officials have warned that prolonged exposure to the heat could be dangerous, particularly for children, older adults, and people with underlying health conditions.
New York City Mayor Zohran Mamdani described the conditions as “extremely dangerous” and urged residents to limit outdoor activities during the hottest parts of the day.
US President Donald Trump is expected to host an outdoor event celebrating America’s 250th anniversary despite the soaring temperatures. Speaking ahead of the event, Trump said he still plans to deliver his address outdoors.
While some central regions may experience cooler weather as thunderstorms move through, forecasters warn that the eastern United States will continue to face dangerous heat through the weekend.
Meteorologists are also monitoring severe thunderstorms expected across the northern Plains, Midwest, and Great Lakes. The storms could bring damaging winds, large hail, flash flooding, and isolated tornadoes, providing a dramatic end to the current heatwave in some areas.
The extreme temperatures are expected to shift toward Virginia, the Carolinas, and the southeastern United States by Sunday before expanding into western parts of the US and Canada next week.
Canada is also experiencing unusually high temperatures, particularly in Ontario and Quebec. Heat warnings remain in effect across several regions, including Montreal and Quebec City.
Severe thunderstorms in Quebec have also left tens of thousands of residents without electricity. According to Hydro-Québec, more than 137,000 customers lost power at the height of Thursday night’s storms, with outages primarily caused by strong winds and lightning. Thousands remained without electricity on Friday morning as restoration efforts continued.
Weather officials continue to urge residents across both the United States and Canada to monitor forecasts, stay hydrated, and follow local safety advisories as the dangerous heatwave persists.
