Historic Heatwave Sweeps US From Kansas to New York Ahead of July 4

Historic heatwave scorches US as millions brace for dangerous temperatures ahead of July 4

A powerful heatwave spread from the Midwest into the eastern United States on Wednesday, placing tens of millions of people under heat alerts ahead of the July 4 holiday weekend, when Americans will celebrate the country’s 250th Independence Day.

Forecasters warned that the heat index, which combines temperature and humidity, could make it feel as hot as 100°F to 115°F (38°C to 46°C) across large parts of the country. Officials cautioned that the prolonged heat could increase the risk of heat-related illnesses, particularly among children, older adults and people with underlying health conditions.

The soaring temperatures have also raised concerns about electricity demand, with power grids facing additional pressure from increased air-conditioning use alongside growing energy consumption from data centres and electric vehicles.

In Hill City, Kansas, temperatures climbed above 100°F, making life especially difficult for outdoor workers. Mail carrier Sabrina Hooper, who recently started her job, described the conditions as “completely debilitating,” saying she relied on lawn sprinklers to cool off during her delivery route.

Residents elsewhere also reported feeling the impact of the heat. In Brownsville, Texas, Dana Robles expressed concern over soaring electricity bills and the possibility of power outages, saying her family’s monthly cooling costs can exceed $300 during the hottest months.

In the Chicago area, residents took precautions before the worst of the heat arrived. High-school teacher Michelle Klein stocked up on groceries and cold drinks over the weekend, while property owner Amy Kaspar responded to complaints from tenants struggling to keep their homes cool despite functioning air-conditioning systems.

Authorities in several cities urged residents to stay hydrated, avoid prolonged outdoor activity and check on elderly neighbours and vulnerable family members. Chicago officials advised residents to request welfare checks through the city’s emergency services if they were unable to contact at-risk individuals.

The heatwave comes as parts of western Europe are also experiencing record-breaking temperatures, reinforcing scientists’ warnings that climate change is increasing the frequency and intensity of extreme heat events worldwide.

In New York City, where temperatures continued to rise on Wednesday, officials expanded measures to protect residents from the extreme weather. Hundreds of cooling centres were opened across the city, while mobile “cool vans” were deployed to distribute drinking water, electrolytes, sunscreen and meals to people in need.

Mayor Zohran Mamdani said additional public pools would remain open for longer hours over the holiday weekend, while libraries and other municipal buildings were serving as cooling centres.

The city’s electricity provider, Con Edison, urged customers to reduce power consumption during peak evening hours to help ease pressure on the grid. Businesses were also encouraged to keep thermostats at or above 78°F, while operators of Times Square’s iconic digital billboards were asked to dim displays to conserve electricity.

Meteorologists said the dangerous heat is expected to persist through the Independence Day weekend, with officials continuing to urge people to take precautions as millions prepare to travel and attend outdoor celebrations.