National Weather ServiceArizonaExtreme Heat WarningArchive to October 1, 2026
Extreme Heat Warnings in Arizona
The National Weather Service issued 27 extreme heat warnings for Arizona in 2025 and 21 a year on average in 2008-2025; in 2021-2025 it had the 8th most of any state. 2026 through September: 31, 45% above the average of 21 for those months in 2008-2025. Lake Havasu and Fort Mohave was covered most often (90 times since 2008).
How many extreme heat warnings does Arizona get?
Every extreme heat warning that covered part of Arizona. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 31 |
| 2025 | 27 |
| 2024 | 28 |
| 2023 | 21 |
| 2022 | 22 |
| 2021 | 24 |
| 2020 | 46 |
| 2019 | 25 |
| 2018 | 28 |
| 2017 | 14 |
| 2016 | 15 |
| 2015 | 15 |
| 2014 | 10 |
| 2013 | 12 |
| 2012 | 18 |
| 2011 | 17 |
| 2010 | 17 |
| 2009 | 15 |
| 2008 | 30 |
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
When in the year does Arizona get them?
Sum of 2008-2025; the busiest month is labelled.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
Where in Arizona?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Lake Havasu and Fort Mohave | 90 | 22 | September 10, 2026 |
| Lake Mead National Recreation Area | 87 | 21 | March 18, 2026 |
| Northwest Deserts | 80 | 22 | September 10, 2026 |
| South Mountain/Ahwatukee | 75 | 26 | September 8, 2026 |
| North Phoenix/Glendale | 75 | 26 | September 8, 2026 |
| East Valley | 75 | 26 | September 8, 2026 |
| Central Phoenix | 75 | 26 | September 8, 2026 |
| Buckeye/Avondale | 75 | 26 | September 8, 2026 |
| Southeast Valley/Queen Creek | 74 | 26 | September 8, 2026 |
| Scottsdale/Paradise Valley | 74 | 26 | September 8, 2026 |
| Yuma | 73 | 27 | September 8, 2026 |
| Northwest Valley | 72 | 26 | September 8, 2026 |
The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
The latest extreme heat warnings for Arizona in AreaZine's record
NWS Las VegasWarningSeptember 9, 2026
Extreme Heat Warning: Lake Havasu and Fort Mohave, Lake Mead - AZ side, Lake Mohave - AZ side and 9 more, AZ and CA
Expired 8:00 p.m. PDT, September 10, 2026
NWS PhoenixWarningSeptember 7, 2026
Extreme Heat Warning: Kofa, Southeast Yuma County, Gila River Valley and 3 more, AZ
Expired 8:00 p.m. PDT, September 10, 2026
NWS TucsonWarningAugust 29, 2026
Extreme Heat Warning: 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 and 3 mo
Expired 8:00 p.m. PDT, August 29, 2026
NWS PhoenixWarningAugust 24, 2026
Extreme Heat Warning: Tonto Basin, Dripping Springs and Globe/Miami, AZ
Expired 8:00 p.m. PDT, August 28, 2026
NWS FlagstaffWarningAugust 24, 2026
Extreme Heat Warning: Grand Canyon Country, AZ
Expired 8:00 p.m. PDT, August 28, 2026
NWS FlagstaffWarningAugust 17, 2026
Extreme Heat Warning: Grand Canyon Country, AZ
Expired 8:00 p.m. PDT, August 20, 2026
NWS Las VegasWarningAugust 17, 2026
Extreme Heat Warning: Lake Havasu and Fort Mohave, Lake Mead - AZ side, Lake Mohave - AZ side and 13 more, AZ and CA
Expired 8:00 p.m. PDT, August 21, 2026
NWS FlagstaffWarningAugust 9, 2026
Extreme Heat Warning: Marble and Glen Canyons and Grand Canyon Country, AZ
Expired 8:00 p.m. PDT, August 9, 2026
This list is AreaZine's record of the NWS alert feed, kept since April 6, 2026; the counts above come from the complete IEM archive.
Source: National Weather Service alerts (api.weather.gov).
What is an extreme heat warning?
An extreme heat warning means dangerous heat is expected, measured by heat index or temperature thresholds each office sets. It replaced the excessive heat warning in 2025. A warning means the hazard is happening, about to happen, or very likely: act now to protect people and property. AreaZine's counts include the excessive heat warnings issued before the change. The national record · Every warning type in Arizona.