Alert archive / Extreme Heat Warnings

Extreme Heat Warnings in the United States, 2026

315 extreme heat warnings in 2026. Each alert counts once, however many counties it covered. The last few weeks are still filling in as offices finish their follow-ups. The archive of extreme heat warnings reaches back to 2005.

Extreme Heat Warnings by state

Each state shaded by its count. Tap a state for its own archive.

AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFLPR
Extreme Heat Warnings
315
Busiest month
July147 extreme heat warnings
Busiest day
July 25, 202619 extreme heat warnings

Over time

By month

By state

Every state and territory, with the alerts that covered any part of it. Each state’s page lists every one of them.

11 more states

The busiest days

Days with the most alerts issued, by UTC date.

  1. July 25, 202619extreme heat warnings
  2. June 30, 202616extreme heat warnings
  3. July 27, 202616extreme heat warnings
  4. August 17, 202614extreme heat warnings
  5. July 21, 202611extreme heat warnings
  6. June 28, 202610extreme heat warnings
  7. July 26, 20269extreme heat warnings
  8. July 28, 20269extreme heat warnings
  9. August 23, 20269extreme heat warnings
  10. July 1, 20267extreme heat warnings
  11. July 29, 20267extreme heat warnings
  12. August 12, 20267extreme heat warnings
  13. June 27, 20266extreme heat warnings
  14. July 9, 20266extreme heat warnings
  15. July 10, 20266extreme heat warnings

Nearby

Alerts in force nowThe tornado archiveThe radar archive2025

Sources

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Rebuilt daily.