Record-Breaking Heat: US Cities See Unprecedented Number of 100-Degree Days in 2026
New data reveals record-shattering heat across the US in 2026. Discover which cities faced the most 100-degree days and the impact of extreme climate trends.
POLICY WIRE — Washington, USA — The summer of 2026 has officially gone down as the hottest in American history, with a fresh analysis highlighting a surge in triple-digit temperature days across numerous metropolitan areas.
According to findings from forecaster AccuWeather, the southern United States bore the brunt of this extreme weather. Dallas, Texas, led the nation with 52 days reaching at least 100 degrees Fahrenheit (37.7 degrees Celsius), a figure that more than doubles the city’s historical average and dwarfs the seven such days recorded in 2025.
Austin, Texas, followed closely behind with 48 days of intense heat, more than doubling its own count from the previous year. Oklahoma City, Tulsa, and Wichita rounded out the top five, with Oklahoma City experiencing a dramatic jump from just one day at or above 100 degrees in 2025 to 35 days this year.
The trend of record-breaking heat extended well beyond the South. Lander, Wyoming, and New York City’s Kennedy Airport both tied their historical records of three days at or above 100 degrees, while Atlantic City matched its record of four. Miami also reached a significant milestone by tying its all-time record high of 100 degrees, an event that has occurred only once previously.
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Colorado faced particularly severe conditions, recording 27 days over 100 degrees and shattering a previous record established in 2002. Experts point to persistent heat domes, such as the one that settled over the South in September, as a primary driver for these broken records.
While the arrival of fall brings some relief, the combination of climate change and a strengthening super El Niño pattern continues to push temperatures higher across the country. These shifts are already manifesting in altered fall foliage patterns and extended hurricane and wildfire seasons.
Public health officials remain concerned, as heat is currently the leading cause of weather-related deaths in the United States. The National Weather Service’s Heat Index warns that temperatures exceeding 80 degrees Fahrenheit (26.6 degrees Celsius) can present significant risks to human health.
Reporting by Policy-Wire (PW)
