Alert archive / Extreme Heat Warnings

Extreme Heat Warnings in the United States, 2025

183 extreme heat warnings in 2025. Each alert counts once, however many counties it covered. 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
183
Busiest month
July87 extreme heat warnings
Busiest day
July 27, 202515 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.

7 more states

The busiest days

Days with the most alerts issued, by UTC date.

  1. July 27, 202515extreme heat warnings
  2. June 21, 20259extreme heat warnings
  3. July 29, 20259extreme heat warnings
  4. August 18, 20259extreme heat warnings
  5. July 26, 20258extreme heat warnings
  6. June 19, 20256extreme heat warnings
  7. June 23, 20256extreme heat warnings
  8. July 18, 20256extreme heat warnings
  9. July 28, 20256extreme heat warnings
  10. June 22, 20255extreme heat warnings
  11. July 21, 20255extreme heat warnings
  12. July 30, 20255extreme heat warnings
  13. August 19, 20255extreme heat warnings
  14. June 16, 20254extreme heat warnings
  15. June 20, 20254extreme heat warnings

Nearby

Alerts in force nowThe tornado archiveThe radar archive20242026

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.