Extreme Heat Warning map: active extreme heat warnings now
There are no extreme heat warnings in effect right now. The most recent one in the NWS archive was issued on October 7, 2026 in Arizona.
Dangerous, potentially deadly heat is expected. Stay cool and check on vulnerable people.
Updated from the National Weather Service · lists refresh hourly; the live map loads current alerts directly from the NWS
Active extreme heat warnings
None right now. This page updates automatically when the National Weather Service issues a new extreme heat warning.
What is a extreme heat warning?
An extreme heat warning (formerly the excessive heat warning) is the highest heat alert. It is issued when the heat index or air temperature reaches dangerous levels, often for several days, with little relief overnight.
What to do
- Stay in air conditioning as much as possible.
- Check on older relatives and neighbors at least twice a day.
- Reschedule outdoor work to early morning.
How often extreme heat warnings are issued
From 2016 through 2025 the National Weather Service issued an average of 209 extreme heat warnings per year across the country, and 319 so far in 2026. Each count is one alert event, which can cover one or many counties.
States with the most extreme heat warnings
| State | Average per year |
|---|---|
| California | 37.4 |
| Texas | 36 |
| Arkansas | 27.7 |
| Arizona | 25 |
| Oklahoma | 17.5 |
| Louisiana | 17.3 |
| Mississippi | 16.1 |
| Puerto Rico | 12.9 |
| Missouri | 12 |
| Nevada | 8.4 |
| Kansas | 8.2 |
| Oregon | 6.5 |
| Florida | 6.2 |
| Illinois | 5.9 |
| Washington | 5.8 |
Extreme Heat Warnings by state
Related alerts
Frequently asked questions
What replaced the excessive heat warning?
The National Weather Service renamed it the extreme heat warning. The criteria and meaning are the same.