Arizona Severe Extreme Heat Watch | Effective 07/05/2026 11:29

Headline: 
Extreme Heat Watch issued July 5 at 11:29AM MST until July 11 at 8:00PM MST by NWS Flagstaff AZ
Event: 
Extreme Heat Watch
Urgency: 
Future
Effective: 
July 5, 2026 - 11:29am
Expires: 
July 6, 2026 - 7:00am
Description: 
* WHAT...For the Extreme Heat Warning below 4000 feet, dangerously hot conditions expected below 4000 feet, with daytime temperatures ranging from 98 degrees at Havasupai Gardens, to 112 degrees at Phantom Ranch. For the Extreme Heat Watch below 4000 feet, dangerously hot conditions possible below 4000 feet, with daytime temperatures ranging from 99 degrees at Havasupai Gardens, to 113 degrees at Phantom Ranch. * WHERE...Lower elevations of the Grand Canyon. * WHEN...For the Extreme Heat Warning, from 10 AM Monday to 8 PM MST Wednesday. For the Extreme Heat Watch, from Wednesday evening through Saturday evening. * IMPACTS...Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor exposure.
Instruction: 
This warning is reserved for only the hottest days of the year and is issued when temperatures are expected to rise to dangerous levels. Day hikers on Bright Angel Trail should descend no farther than 1 1/2 miles from the upper trailhead. Between the hours of 10 AM and 4 PM, hikers should be out of the canyon or at Havasupai Gardens or Bright Angel campgrounds, physical activity is discouraged. All hikers should have adequate gear, including a wide-brimmed hat, sunscreen, salty snacks, sufficient water, and electrolyte mix. Doubling your calorie intake helps maintain your energy. Hike smart. This watch is reserved for only the hottest days of the year and is issued when temperatures could rise to dangerous levels. Day hikers on Bright Angel Trail should descend no farther than 1 1/2 miles from the upper trailhead. Between the hours of 10 AM and 4 PM, hikers should be out of the canyon or at Havasupai Gardens or Bright Angel campgrounds, physical activity is discouraged. All hikers should have adequate gear, including a wide-brimmed hat, sunscreen, salty snacks, sufficient water, and electrolyte mix. Doubling your calorie intake helps maintain your energy. Hike smart.
Area Description: 
Grand Canyon Country
Forcast Office: 
NWS Flagstaff AZ
Sender: 
[email protected]