Extreme Heat Warning for Grand Canyon Country
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An Extreme Heat Warning is in effect for lower elevations of the Grand Canyon below 4000 feet from 10 AM Tuesday to 8 PM MST Thursday.
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- Record type
- Extreme Heat Warning
- Affected area
- Grand Canyon Country
- Issued
- August 18, 2026
- Issuing authority
- NWS Flagstaff AZ
Heat notices are time-bound and location-specific. Confirm the current forecast and local public-health guidance before relying on this archived record.
Record status: publication date is recent, but current status is not stored on this page. Check the issuing agency's live warning service before acting because warnings can be updated, narrowed, or cancelled.
Alert Details
Extreme Heat Warning issued by NWS Flagstaff AZ. Effective from 2026-08-17T21:28:00-07:00, with onset at 2026-08-18T10:00:00-07:00 and ending 2026-08-20T20:00:00-07:00. Alert type code: XHW.
Affected Areas
Lower elevations of the Grand Canyon below 4000 feet, including Havasupai Gardens and Phantom Ranch in Grand Canyon Country (AZZ006).
What You Should Do
Day hikers on Bright Angel Trail should descend no farther than 1 1/2 miles from the upper trailhead. Between 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 calorie intake helps maintain energy.
Expected Conditions
Dangerously hot conditions with daytime temperatures ranging from 94 to 99 degrees at Havasupai Gardens and 107 to 111 degrees at Phantom Ranch.
Timeline
Warning in effect from 10 AM Tuesday through 8 PM MST Thursday.
Original source: NOAA Official Notice ↗
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