California extreme heat warnings
There are no extreme heat warnings in California right now. The last one was issued on October 7, 2026.
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 in California
None right now. Other active alerts in California: 19 (see the California alerts page).
Extreme Heat Warnings in California by year
California averaged 37.4 extreme heat warnings per year from 2016 to 2025, and has had 39 so far in 2026. The most recent was issued on October 7, 2026.
Counties with the most extreme heat warnings
What a extreme heat warning means
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.
More about extreme heat warnings and the national map →
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.