Arizona Severe Extreme Heat Watch | Effective 06/19/2026 21:27

Headline: 
Extreme Heat Watch issued June 19 at 9:27PM MST until June 23 at 7:00PM MST by NWS Flagstaff AZ
Event: 
Extreme Heat Watch
Urgency: 
Future
Effective: 
June 19, 2026 - 9:27pm
Expires: 
June 21, 2026 - 5:00am
Description: 
* WHAT...Dangerously hot conditions possible below 4000 feet, with daytime temperatures ranging from 97 degrees at Havasupai Gardens, to 111 degrees at Phantom Ranch. * WHERE...Lower elevations of the Grand Canyon. * WHEN...From Monday morning through Tuesday 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 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