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Summer Goes Out With a Heat Dome
A heat dome caused record-breaking warmth across the south-central United States on September 15, 2026. This weather phenomenon trapped hot air near the surface as astronomical summer ended.
Why it matters
Extreme heat and humidity increase the risk of heat-related illnesses for millions of people in the affected region.
The details
41 million people were under National Weather Service heat advisories or warnings. Nashville broke its daily-high record from 1927 and set a record-high minimum of 75ºF. The June-August 2026 period was 0.4ºF warmer than records from 1936 and 2021. Heat domes develop when high pressure suppresses clouds and traps hot air.
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