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Heat Dome Envelops Eastern U.S. as Nearly 190 Million Face Extreme Heat Warnings

Temperatures are expected to peak Tuesday with scant overnight relief before easing by week’s end.

TORONTO, June 23, 2025 Children cool off in a wading pool in Toronto, Canada, June 22, 2025. Environment Canada issued a heat warning for the City of Toronto from June 22 to 24.
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A couple in sun hats and with an umbrella cross the street as an extreme heat warning is in effect in Queens, New York City, U.S., June 23, 2025. REUTERS/Kylie Cooper

Overview

  • A heat dome has parked a high-pressure ridge over the eastern U.S., pushing daytime temperatures past 100°F and heat indices to 110°F in cities from Baltimore to New York City.
  • Nearly 150 to 190 million Americans from Texas to Maine are under heat advisories and warnings as this first major heat wave of the season expands eastward.
  • Health officials warn that vulnerable populations such as seniors, children and outdoor workers face elevated risks when nighttime lows stay near 80°F and medical facilities prepare for a spike in heat-related illnesses.
  • Philadelphia, Baltimore and New York City have opened dozens of cooling centers offering air conditioning, cold water and public Wi-Fi to help residents withstand the prolonged heat.
  • Federal lawmakers have proposed a bill to study the financial impacts of extreme heat as OSHA continues to consider workplace safety rules and heavy air-conditioning use threatens to strain regional power grids.