New York, Boston, Other Major Cities Under Heat Warnings Right Now

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As a sprawling heat dome settles over much of the eastern and central U.S., more than two dozen major cities are now under official heat advisories. The National Weather Service issued extreme heat warnings in 492 counties – affecting more than 96 million Americans – and is warning of dangerous temperatures and oppressive humidity that could last through the end of the week, threatening power grids, straining public health systems, and pushing some cities to the brink of their historical heat records.

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Several major cities are forecast to break daily heat records, with a handful of smaller cities projected to experience triple-digit temperatures for the first time in recorded history. Extreme heat is also exacerbating harmful ozone concentrations, prompting the NWS to issue air quality alerts in 164 counties. A closer look at the data reveals the major cities under heat warnings right now.

To determine the major cities currently under heat advisory, Climate Crisis 247 reviewed extreme heat warnings and advisories from the National Weather Service as of June 23, 2025. Cities under current extreme heat warnings and advisories were ranked based on population. Supplemental data on forecast maximum temperature and record temperatures are from the NOAA’s National Digital Forecast Database and Global Historical Climatology Network programs. Supplemental data on population are from the U.S. Census Bureau.

25. Durham, NC

• Forecast maximum, June 23-25, 2025: 101.9°F
• Highest maximum ever recorded: 105.1°F (September 6, 1954)
• Heat advisory ends: June 25, 2025
• Total population: 284,094

 

24. Jersey City, NJ

• Forecast maximum, June 23-25, 2025: 98.3°F
• Highest maximum ever recorded: 106.0°F (August 7, 1918)
• Heat advisory ends: June 24, 2025
• Total population: 287,899

 

23. Greensboro, NC

• Forecast maximum, June 23-25, 2025: 99.0°F
• Highest maximum ever recorded: 104.0°F (June 28, 1954)
• Heat advisory ends: June 25, 2025
• Total population: 297,202

 

22. St. Louis, MO

• Forecast maximum, June 23-25, 2025: 95.2°F
• Highest maximum ever recorded: 107.1°F (July 26, 2012)
• Heat advisory ends: June 26, 2025
• Total population: 298,018

 

21. Pittsburgh, PA

• Forecast maximum, June 23-25, 2025: 96.4°F
• Highest maximum ever recorded: 100.0°F (August 27, 1948)
• Heat advisory ends: June 25, 2025
• Total population: 303,843

 

20. Newark, NJ

• Forecast maximum, June 23-25, 2025: 101.6°F
• Highest maximum ever recorded: 107.1°F (July 22, 2011)
• Heat advisory ends: June 24, 2025
• Total population: 307,355

 

19. Cincinnati, OH

• Forecast maximum, June 23-25, 2025: 96.4°F
• Highest maximum ever recorded: 108.0°F (July 21, 1934)
• Heat advisory ends: June 25, 2025
• Total population: 308,870

 

18. Lexington-Fayette, KY

• Forecast maximum, June 23-25, 2025: 93.9°F
• Highest maximum ever recorded: 108.0°F (July 15, 1936)
• Heat advisory ends: June 25, 2025
• Total population: 321,276

 

17. Cleveland, OH

• Forecast maximum, June 23-25, 2025: 93.8°F
• Highest maximum ever recorded: 100.0°F (June 28, 1934)
• Heat advisory ends: June 24, 2025
• Total population: 370,365

 

16. Virginia Beach, VA

• Forecast maximum, June 23-25, 2025: 92.8°F
• Highest maximum ever recorded: 104.0°F (June 27, 1949)
• Heat advisory ends: June 25, 2025
• Total population: 457,900

 

15. Raleigh, NC

• Forecast maximum, June 23-25, 2025: 101.8°F
• Highest maximum ever recorded: 107.1°F (July 29, 2011)
• Heat advisory ends: June 25, 2025
• Total population: 465,517

 

14. Atlanta, GA

• Forecast maximum, June 23-25, 2025: 98.7°F
• Highest maximum ever recorded: 106.0°F (June 30, 2012)
• Heat advisory ends: June 25, 2025
• Total population: 494,838

 

13. Baltimore, MD

• Forecast maximum, June 23-25, 2025: 100.7°F
• Highest maximum ever recorded: 107.1°F (July 10, 1936)
• Heat advisory ends: June 24, 2025
• Total population: 584,548

 

12. Louisville/Jefferson County, KY

• Forecast maximum, June 23-25, 2025: 94.9°F
• Highest maximum ever recorded: 107.1°F (September 2, 2000)
• Heat advisory ends: June 25, 2025
• Total population: 629,176

 

11. Memphis, TN

• Forecast maximum, June 23-25, 2025: 96.0°F
• Highest maximum ever recorded: 108.0°F (July 13, 1980)
• Heat advisory ends: June 27, 2025
• Total population: 630,027

 

10. Detroit, MI

• Forecast maximum, June 23-25, 2025: 97.8°F
• Highest maximum ever recorded: 102.9°F (July 14, 1995)
• Heat advisory ends: June 24, 2025
• Total population: 636,787

 

9. Boston, MA

• Forecast maximum, June 23-25, 2025: 97.5°F
• Highest maximum ever recorded: 102.9°F (July 22, 2011)
• Heat advisory ends: June 24, 2025
• Total population: 665,945

 

8. Washington, DC

• Forecast maximum, June 23-25, 2025: 101.3°F
• Highest maximum ever recorded: 102.9°F (August 1, 1954)
• Heat advisory ends: June 24, 2025
• Total population: 670,587

 

7. Nashville-Davidson, TN

• Forecast maximum, June 23-25, 2025: 96.7°F
• Highest maximum ever recorded: 109.0°F (June 29, 2012)
• Heat advisory ends: June 27, 2025
• Total population: 684,103

 

6. Charlotte, NC

• Forecast maximum, June 23-25, 2025: 99.0°F
• Highest maximum ever recorded: 102.9°F (August 20, 1925)
• Heat advisory ends: June 25, 2025
• Total population: 875,045

 

5. Indianapolis, IN

• Forecast maximum, June 23-25, 2025: 95.4°F
• Highest maximum ever recorded: 104.0°F (June 26, 1988)
• Heat advisory ends: June 27, 2025
• Total population: 882,006

 

4. Columbus, OH

• Forecast maximum, June 23-25, 2025: 96.5°F
• Highest maximum ever recorded: 107.1°F (July 14, 1936)
• Heat advisory ends: June 25, 2025
• Total population: 902,449

 

3. Philadelphia, PA

• Forecast maximum, June 23-25, 2025: 100.9°F
• Highest maximum ever recorded: 106.0°F (August 7, 1918)
• Heat advisory ends: June 25, 2025
• Total population: 1,593,208

 

2. Chicago, IL

• Forecast maximum, June 23-25, 2025: 95.5°F
• Highest maximum ever recorded: 107.1°F (June 1, 1934)
• Heat advisory ends: June 24, 2025
• Total population: 2,721,914

 

1. New York, NY

• Forecast maximum, June 23-25, 2025: 96.0°F
• Highest maximum ever recorded: 102.0°F (August 7, 1918)
• Heat advisory ends: June 25, 2025
• Total population: 8,622,467

 

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