From LA to NY, What Is The Hottest Day of the Year in These 25 Cities?
https://climate-crisis-247-bucket.nyc3.digitaloceanspaces.com/wp-content/uploads/2025/07/07211149/Warmest-Day-of-the-Year-Across-the-Country-150x150.pngThis week, a brutal heat dome is affecting large swaths of the Northeast and Southeast. On Tuesday, the heat wave will peak, with approximately nine million Americans exposed to extreme heat risk across 80 counties.
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While temperatures are breaching 100°F up and down the East Coast, summer is far from over in much of the country. Based on historical averages, 32.1% of the U.S. population is yet to experience their hottest day of the year. While about one-fourth of the country – 87.8 million Americans – experiences its hottest temperatures in seven days between July 12 and July 18, there are hundreds of cities in the West Coast and South where the hottest day historically occurs in August or later. A closer look at the data reveals when the hottest day of the year falls in major cities across the country.
To determine where the hottest day of the year falls across the country, Climate Crisis 247 reviewed historical weather station-level observations on maximum temperature for the years 1851 to 2024. Daily normal temperature maximums were averaged across all available data years and ranked based on daily average high. Weather stations were matched to cities using nearest neighbor analysis. Cities are ordered by population.
25. Portland, OR
- Hottest day of the year: July 26 (average high of 82.2°F)
- Hottest July 26 on record: 2022 (high of 100.9°F)
- Population: 646,101
24. Boston, MA
- Hottest day of the year: July 17 (average high of 83.9°F)
- Hottest July 17 on record: 1977 (high of 98.1°F)
- Population: 665,945
23. Washington, DC
- Hottest day of the year: July 18 (average high of 90.7°F)
- Hottest July 18 on record: 1988 (high of 102.9°F)
- Population: 670,587
22. El Paso, TX
- Hottest day of the year: June 17 (average high of 99.5°F)
- Hottest June 17 on record: 1980 (high of 109.0°F)
- Population: 677,181
21. Oklahoma City, OK
- Hottest day of the year: July 25 (average high of 94.3°F)
- Hottest July 25 on record: 1977 (high of 106.0°F)
- Population: 681,088
20. Nashville, TN
- Hottest day of the year: July 22 (average high of 91.4°F)
- Hottest July 22 on record: 1952 (high of 102.9°F)
- Population: 684,103
19. Denver, CO
- Hottest day of the year: July 12 (average high of 90.7°F)
- Hottest July 12 on record: 1954 (high of 100.9°F)
- Population: 710,800
18. Seattle, WA
- Hottest day of the year: July 26 (average high of 79.1°F)
- Hottest July 26 on record: 2022 (high of 93.9°F)
- Population: 734,603
17. San Francisco, CA
- Hottest day of the year: October 19 (average high of 67.1°F)
- Hottest October 19 on record: 1964 (high of 84.0°F)
- Population: 851,036
16. Charlotte, NC
- Hottest day of the year: July 8 (average high of 90.9°F)
- Hottest July 8 on record: 2010 (high of 100.9°F)
- Population: 875,045
15. Indianapolis, IN
- Hottest day of the year: July 18 (average high of 85.7°F)
- Hottest July 18 on record: 1954 (high of 100.0°F)
- Population: 882,006
14. Columbus, OH
- Hottest day of the year: July 20 (average high of 85.8°F)
- Hottest July 20 on record: 1957 (high of 98.1°F)
- Population: 902,449
13. Fort Worth, TX
- Hottest day of the year: August 3 (average high of 96.2°F)
- Hottest August 3 on record: 2011 (high of 109.9°F)
- Population: 924,663
12. Jacksonville, FL
- Hottest day of the year: July 5 (average high of 93.0°F)
- Hottest July 5 on record: 1998 (high of 99.0°F)
- Population: 950,203
11. Austin, TX
- Hottest day of the year: August 7 (average high of 100.5°F)
- Hottest August 7 on record: 2003 (high of 108.0°F)
- Population: 958,202
10. San Jose, CA
- Hottest day of the year: July 13 (average high of 80.0°F)
- Hottest July 13 on record: 1972 (high of 97.0°F)
- Population: 1,001,176
9. Dallas, TX
- Hottest day of the year: August 5 (average high of 99.2°F)
- Hottest August 5 on record: 1956 (high of 109.0°F)
- Population: 1,300,642
8. San Diego, CA
- Hottest day of the year: August 26 (average high of 83.8°F)
- Hottest August 26 on record: 1981 (high of 97.0°F)
- Population: 1,383,987
7. San Antonio, TX
- Hottest day of the year: August 6 (average high of 97.9°F)
- Hottest August 6 on record: 2013 (high of 105.1°F)
- Population: 1,445,662
6. Philadelphia, PA
- Hottest day of the year: July 13 (average high of 90.6°F)
- Hottest July 13 on record: 1997 (high of 97.0°F)
- Population: 1,593,208
5. Phoenix, AZ
- Hottest day of the year: July 1 (average high of 106.3°F)
- Hottest July 1 on record: 2010 (high of 113.0°F)
- Population: 1,609,456
4. Houston, TX
- Hottest day of the year: August 8 (average high of 96.1°F)
- Hottest August 8 on record: 1988 (high of 102.0°F)
- Population: 2,296,253
3. Chicago, IL
- Hottest day of the year: July 16 (average high of 86.0°F)
- Hottest July 16 on record: 1988 (high of 99.0°F)
- Population: 2,721,914
2. Los Angeles, CA
- Hottest day of the year: September 3 (average high of 79.2°F)
- Hottest September 3 on record: 2017 (high of 99.0°F)
- Population: 3,881,041
1. New York, NY
- Hottest day of the year: July 17 (average high of 86.4°F)
- Hottest July 17 on record: 1953 (high of 100.0°F)
- Population: 8,622,467
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