Arizona Extreme Heat Warning - Severe | Effective 06/15/2026 12:02
* WHAT...Dangerously hot conditions expected below 4000 feet, with
daytime temperatures ranging from 102 degrees at Havasupai Gardens,
to 110 degrees at Phantom Ranch.
* WHERE...Lower elevations of the Grand Canyon.
* WHEN...From 10 AM Tuesday to 8 PM MST Wednesday.
* IMPACTS...Most individuals will be at risk for heat-related
illnesses without effective cooling or adequate hydration,
especially with prolonged outdoor exposure.
This warning is reserved for only the hottest days of the year and is