Weather Warnings for Arizona

Issued by the National Weather Service

Current watches, warnings, and advisories for Arizona
Alerts Updated: March 19, 2026, 7:51 am  UTC


Extreme Heat Warning issued March 19 at 12:50AM MST until March 22 at 8:00PM MST by NWS Tucson AZ

Summary: * WHAT...Dangerously hot conditions with high temperatures of 100 to 108 degrees expected. The hottest days are expected to be Friday March 20 and Saturday March 21. * WHERE...South Central Pinal County, Southeast Pinal County, Tohono O'odham Nation, Tucson Metro Area, and Western Pima County. * WHEN...From 11 AM this morning to 8 PM MST Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Visitors, seasonal residents, and other people not typically accustomed to or acclimated to extreme heat are especially urged to take precautions during the hottest hours of the day and limit outdoor activity.
Severity:  Severe    Effective:  March 19, 2026, 12:50 am      Expires:  March 19, 2026, 5:15 pm
Area:  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


Extreme Heat Warning issued March 19 at 12:50AM MST until March 22 at 8:00PM MST by NWS Tucson AZ

Summary: * WHAT...Dangerously hot conditions with high temperatures of 95 to 100 degrees expected. The hottest days are expected to be Friday March 20 and Saturday March 21. * WHERE...Eastern Cochise County below 5000 feet, Upper Gila River Valley, Upper San Pedro River Valley, and Upper Santa Cruz River Valley/Altar Valley. * WHEN...From 11 AM this morning to 8 PM MST Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Visitors, seasonal residents, and other people not typically accustomed to or acclimated to extreme heat are especially urged to take precautions during the hottest hours of the day and limit outdoor activity.
Severity:  Severe    Effective:  March 19, 2026, 12:50 am      Expires:  March 19, 2026, 5:15 pm
Area:  Upper Santa Cruz River and Altar Valleys including Nogales; Upper San Pedro River Valley including Sierra Vista/Benson; Eastern Cochise County Below 5000 Feet including Douglas/Willcox; Upper Gila River and Aravaipa Valleys including Clifton/Safford


Extreme Heat Warning issued March 19 at 12:06AM MST until March 22 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 100 to 107 expected. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * WHERE...The Northwest Valley of the Phoenix Metro Area, The East Valley of the Phoenix Metro Area, Buckeye/Avondale, Deer Valley, Central Phoenix, North Phoenix/Glendale, Scottsdale/Paradise Valley, South Mountain/Ahwatukee, and Southeast Valley/Queen Creek. * WHEN...From 11 AM Thursday to 8 PM MST Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...In Maricopa County, call 2-1-1 if you need help finding resources. More information at https://www.maricopa.gov/heat.
Severity:  Severe    Effective:  March 19, 2026, 12:06 am      Expires:  March 19, 2026, 3:00 pm
Area:  Northwest Valley; Buckeye/Avondale; Deer Valley; Central Phoenix; North Phoenix/Glendale; Scottsdale/Paradise Valley; East Valley; South Mountain/Ahwatukee; Southeast Valley/Queen Creek


Extreme Heat Warning issued March 19 at 12:06AM MST until March 22 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 95 to 106 expected. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * WHERE...Apache Junction/Gold Canyon, Cave Creek/New River, Dripping Springs, Fountain Hills/East Mesa, New River Mesa, Rio Verde/Salt River, and Superior. * WHEN...From 11 AM Thursday to 8 PM MST Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.
Severity:  Severe    Effective:  March 19, 2026, 12:06 am      Expires:  March 19, 2026, 3:00 pm
Area:  Cave Creek/New River; New River Mesa; Rio Verde/Salt River; Fountain Hills/East Mesa; Superior; Apache Junction/Gold Canyon; Dripping Springs


Extreme Heat Warning issued March 19 at 12:06AM MST until March 22 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 97 to 108 expected. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * WHERE...Portions of south central and southwest Arizona. * WHEN...From 11 AM Thursday to 8 PM MST Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.
Severity:  Severe    Effective:  March 19, 2026, 12:06 am      Expires:  March 19, 2026, 3:00 pm
Area:  Kofa; Yuma; Central La Paz; Aguila Valley; Southeast Yuma County; Gila River Valley; Tonopah Desert; Gila Bend; Northwest Pinal County; West Pinal County; Sonoran Desert Natl Monument


Extreme Heat Warning issued March 19 at 12:06AM MST until March 22 at 8:00PM MST by NWS Phoenix AZ

Summary: * WHAT...Dangerously hot conditions. Afternoon temperatures 96 to 109. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * WHERE...Portions of southwest Arizona and southeast and southern California. * WHEN...Until 8 PM MST /8 PM PDT/ Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.
Severity:  Severe    Effective:  March 19, 2026, 12:06 am      Expires:  March 19, 2026, 3:00 pm
Area:  Parker Valley; Joshua Tree NP East; Imperial County Southwest; Salton Sea; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley; Chiriaco Summit; Palo Verde Valley; Chuckwalla Valley


Extreme Heat Warning issued March 19 at 12:03AM PDT until March 22 at 8:00PM PDT by NWS Las Vegas NV

Summary: * WHAT...Dangerously hot temperatures climbing to near-30 degrees above seasonal normals. * WHERE...Portions of northwest Arizona, southeast California, and southern Nevada. * WHEN...Until 8 PM PDT /8 PM MST/ Sunday. * IMPACTS...Heat-related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Extreme early-season heat coupled with high tourism rates will make this heat very dangerous, particularly for those not acclimated to the heat and/or traveling from cooler climates. Numerous daily and monthly heat records are in jeopardy through at least Sunday.
Severity:  Severe    Effective:  March 19, 2026, 12:03 am      Expires:  March 19, 2026, 3:00 pm
Area:  Northwest Plateau; Lake Havasu and Fort Mohave; Northwest Deserts; Lake Mead National Recreation Area; Death Valley National Park; Western Mojave Desert; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin; Cadiz Basin; San Bernardino County-Upper Colorado River Valley; Northeast Clark County; Western Clark and Southern Nye County; Las Vegas Valley; Lake Mead National Recreation Area; Southern Clark County


Extreme Heat Warning issued March 18 at 12:56PM MST until March 22 at 8:00PM MST by NWS Flagstaff AZ

Summary: * WHAT...Dangerously hot conditions below 4000 feet, with daytime temperatures ranging from 94 degrees at Havasupai Gardens, to 100 degrees at Phantom Ranch. * WHERE...Lower elevations of the Grand Canyon. * WHEN...Until 8 PM MST Sunday. * IMPACTS...Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor exposure.
Severity:  Severe    Effective:  March 18, 2026, 12:56 pm      Expires:  March 19, 2026, 5:00 pm
Area:  Grand Canyon Country


Extreme Heat Warning issued March 18 at 12:56PM MST until March 22 at 8:00PM MST by NWS Flagstaff AZ

Summary: * WHAT...Dangerously hot conditions, with temperatures up to 101 below 4000 feet. * WHERE...Lower elevations of Yavapai County Valleys. * WHEN...Until 8 PM MST Sunday. * IMPACTS...Pets, livestock, and those sensitive to heat, such as the homeless, elderly, and children will be at risk for heat-related illnesses. Those without effective cooling and/or adequate hydration will be at the greatest risk.
Severity:  Severe    Effective:  March 18, 2026, 12:56 pm      Expires:  March 19, 2026, 5:00 pm
Area:  Yavapai County Valleys and Basins