Extreme Heat Warning for Grand Canyon Country
This alert is no longer in effect.
NOAA issued it on July 3, 2026, 7 weeks ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
An Extreme Heat Warning is in effect for lower elevations of the Grand Canyon below 4000 feet from 10 AM to 8 PM MST Thursday.
Read this weather record in 30 seconds
- Record type
- Extreme Heat Warning
- Affected area
- Grand Canyon Country, Arizona
- Issued
- July 3, 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: historical. It was issued 7 weeks ago; use the issuing agency's live warning service for current conditions in Grand Canyon Country, Arizona.
Alert Details
Extreme Heat Warning issued by NWS Flagstaff AZ on June 10 at 10:05AM MST, effective from 10 AM to 8 PM MST Thursday.
Affected Areas
Lower elevations of the Grand Canyon Country below 4000 feet, including Havasupai Gardens and Phantom Ranch.
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 carry a wide-brimmed hat, sunscreen, salty snacks, sufficient water, and electrolyte mix. Doubling calorie intake helps maintain energy.
Expected Conditions
Dangerously hot conditions expected below 4000 feet, with daytime temperatures ranging from 101 degrees at Havasupai Gardens to 110 degrees at Phantom Ranch.
Timeline
Alert issued June 10 at 10:05AM MST. Effective from 10 AM MST Thursday, June 11, until 8 PM MST Thursday, June 11.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (998 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to July 3, 2026.
Frequently Asked Questions
Common questions about this NWS weather alert.