Grand Canyon National Park, Arizona
Regional Weather Alerts
| Alert: | Extreme Heat Warning |
| Area(s): | Northwest Valley; Buckeye/Avondale; Deer Valley; Central Phoenix; North Phoenix/Glendale; Scottsdale/Paradise Valley; East Valley; South Mountain/Ahwatukee; Southeast Valley/Queen Creek |
| Effective: | 2026-07-05 @ 1:30 pm -> 2026-07-06 @ 10:30 am |
| Onset: | 2026-07-07 @ 12:00 pm -> 2026-07-09 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Phoenix AZ on 2026-07-05 @ 1:30 pm |
| Headline: | Extreme Heat Warning issued July 5 at 11:30AM MST until July 9 at 8:00PM MST by NWS Phoenix AZ |
| Description: |
* WHAT...Dangerously hot conditions possible. Afternoon temperatures 111 to 116. Major Heat Risk. * WHERE...Buckeye/Avondale, Central Phoenix, Deer Valley, East Valley, North Phoenix/Glendale, Northwest Valley, Scottsdale/Paradise Valley, South Mountain/Ahwatukee, and Southeast Valley/Queen Creek. * WHEN...From 10 AM Tuesday to 8 PM MST Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * ADDITIONAL DETAILS...In Maricopa County, call 2-1-1 to find a free cooling center, transportation, water, and more. http://www.maricopa.gov/heat |
| Alert: | Extreme Heat Warning |
| Area(s): | Parker Valley; Kofa; Yuma; Central La Paz; Gila River Valley; Imperial County Southwest; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley; Chiriaco Summit; Palo Verde Valley; Chuckwalla Valley |
| Effective: | 2026-07-05 @ 1:30 pm -> 2026-07-06 @ 10:30 am |
| Onset: | 2026-07-07 @ 12:00 pm -> 2026-07-09 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Phoenix AZ on 2026-07-05 @ 1:30 pm |
| Headline: | Extreme Heat Warning issued July 5 at 11:30AM MST until July 9 at 8:00PM MST by NWS Phoenix AZ |
| Description: |
* WHAT...Dangerously hot conditions possible. Afternoon temperatures 109 to 117. Major Heat Risk. * WHERE...Portions of southwest Arizona and southeast California. * WHEN...From 10 AM MST /10 AM PDT/ Tuesday to 8 PM MST /8 PM PDT/ Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * ADDITIONAL DETAILS...In Maricopa County, call 2-1-1 to find a free cooling center, transportation, water, and more. http://www.maricopa.gov/heat |
| Alert: | Extreme Heat Warning |
| Area(s): | Aguila Valley; Tonopah Desert; Gila Bend; Cave Creek/New River; New River Mesa; Rio Verde/Salt River; Fountain Hills/East Mesa; Northwest Pinal County; West Pinal County; Apache Junction/Gold Canyon; Sonoran Desert Natl Monument; San Carlos; Globe/Miami |
| Effective: | 2026-07-05 @ 1:30 pm -> 2026-07-06 @ 10:30 am |
| Onset: | 2026-07-07 @ 12:00 pm -> 2026-07-09 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Phoenix AZ on 2026-07-05 @ 1:30 pm |
| Headline: | Extreme Heat Warning issued July 5 at 11:30AM MST until July 9 at 8:00PM MST by NWS Phoenix AZ |
| Description: |
* WHAT...Dangerously hot conditions possible. Afternoon temperatures 109 to 115. Major Heat Risk. * WHERE...Portions of south-central Arizona. * WHEN...From 10 AM Tuesday to 8 PM MST Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * ADDITIONAL DETAILS...In Maricopa County, call 2-1-1 to find a free cooling center, transportation, water, and more. http://www.maricopa.gov/heat |
| Alert: | Extreme Heat Warning |
| Area(s): | Grand Canyon Country |
| Effective: | 2026-07-05 @ 1:29 pm -> 2026-07-06 @ 9:00 am |
| Onset: | 2026-07-06 @ 12:00 pm -> 2026-07-08 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Flagstaff AZ on 2026-07-05 @ 1:29 pm |
| Headline: | Extreme Heat Warning issued July 5 at 11:29AM MST until July 8 at 8:00PM MST by NWS Flagstaff AZ |
| 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. |
| Alert: | Extreme Heat Watch |
| Area(s): | Grand Canyon Country |
| Effective: | 2026-07-05 @ 1:29 pm -> 2026-07-06 @ 9:00 am |
| Onset: | 2026-07-08 @ 10:00 pm -> 2026-07-11 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Future |
| Issued By: | NWS Flagstaff AZ on 2026-07-05 @ 1:29 pm |
| Headline: | Extreme Heat Watch issued July 5 at 11:29AM MST until July 11 at 8:00PM MST by NWS Flagstaff AZ |
| 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. |
| Alert: | Extreme Heat Warning |
| Area(s): | Western Pima County Including Ajo/Organ Pipe Cactus National Monument; Tohono O'odham Nation including Sells; Tucson Metro Area including Tucson/Green Valley/Marana/Vail; South Central Pinal County including Eloy/Picacho Peak State Park; Southeast Pinal County including Kearny/Mammoth/Oracle; Upper Gila River and Aravaipa Valleys including Clifton/Safford |
| Effective: | 2026-07-05 @ 1:23 pm -> 2026-07-06 @ 1:30 am |
| Onset: | 2026-07-07 @ 12:00 pm -> 2026-07-08 @ 10:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS Tucson AZ on 2026-07-05 @ 1:23 pm |
| Headline: | Extreme Heat Warning issued July 5 at 11:23AM MST until July 8 at 8:00PM MST by NWS Tucson AZ |
| Description: |
* WHAT...Dangerously hot conditions with temperatures of 107 to 111 degrees. * WHERE...South Central Pinal County, Southeast Pinal County, Tohono O'odham Nation, Tucson Metro Area, Upper Gila River Valley, and Western Pima County. * WHEN...From 10 AM Tuesday to 8 PM MST Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. |