By Blessing Nweke
Millions of people across the eastern United States are facing dangerous heat and humidity as temperatures climb to around 100°F (38°C), with conditions expected to persist through the Fourth of July holiday weekend.
The National Weather Service (NWS) warned that the heat index, which combines air temperature and humidity to reflect how hot it feels, could reach as high as 115°F in major cities including Washington, D.C., Philadelphia and New York. Officials cautioned that prolonged exposure to the extreme heat, especially without proper cooling or hydration, could pose serious health risks.
The heatwave has spread from the Midwest into the Northeast and Mid-Atlantic, bringing rare, long-lasting high temperatures with little overnight relief. Central Park reached 100°F on Thursday, but the heat index made it feel closer to 106°F, marking New York City’s hottest day in 15 years.
New York City Mayor Zohran Mamdani urged residents to remain indoors whenever possible, emphasizing the importance of staying cool during the extreme weather. Authorities in Washington also restricted attendance at a Fourth of July concert rehearsal, allowing only essential personnel because of the excessive heat.
The soaring temperatures come as President Donald Trump prepares to host an outdoor event marking America’s 250th birthday. Despite forecasts predicting temperatures near 107°F, Trump said he still plans to deliver his speech outside.
Canada is also experiencing unusually high temperatures, with heat warnings covering much of Ontario and Quebec.
Meteorologists say the intense heat is being driven by a persistent “heat dome” over the central and eastern United States. Dry ground conditions have further intensified the warmth by allowing more solar energy to heat the surface.
Forecasters expect temperatures to ease slightly after the holiday weekend as cooler air and possible thunderstorms move into the region, though conditions will remain above seasonal averages.
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