Dangerously hot conditions are currently gripping the Phoenix metropolitan area, with temperatures forecast to reach 113 to 114°F through Thursday evening. The National Weather Service has issued an Extreme Heat Warning for Maricopa County through 8 p.m. MST Thursday — its highest-level heat alert — and the Arizona Department of Health Services has activated public guidance urging residents to stay indoors, use cooling centers, hydrate continuously, and check on vulnerable neighbors.
This is not a routine summer heat advisory. At 114°F, heat exhaustion can develop within 30 minutes for unprotected individuals outdoors. Heat stroke — a life-threatening medical emergency — can follow rapidly.
In Maricopa County, 430 people died from heat-related causes in 2025, according to KJZZ. The 2026 heat season surveillance dashboard, now live at Maricopa County's health department website, shows heat deaths are tracking higher than last year at the same point in the season.
Why This Matters
Phoenix residents who have lived in the Valley for years may underestimate the danger at temperatures above 110°F. Familiarity with summer heat can create a false sense of tolerance. But heat illness is not purely a matter of acclimatization — at high enough temperatures, the body's cooling mechanisms can be overwhelmed regardless of prior experience.
KJZZ meteorologist reporting identified an additional compounding factor this week: Phoenix has received only 0.32 inches of rain in all of 2026 — far below the expected 3-plus inches by this point in July. The exceptionally dry conditions reduce overnight humidity and evaporative cooling effects that normally provide some relief. Overnight lows this week are forecast to remain near or above 87–90°F — warm enough that the body cannot fully recover from daytime heat exposure even during sleeping hours.
The National Weather Service meteorologist Sean Benedict told KJZZ: "The heat's obviously going to be worst during the daylight hours." His colleague Martin O'Malley added: "We advise people, if you need to get outside, do your outdoor activities early in the morning and try to spend the afternoon in the air conditioning."
What We Know So Far
The National Weather Service Phoenix office issued an Extreme Heat Warning for the Phoenix metropolitan area, portions of south-central Arizona, and Maricopa County, running through 8 p.m. MST Thursday, July 9, 2026.
The AZFamily weather alert lists the projected daily forecast through Thursday:
- Monday : High near 111°F, overnight low near 87°F
- Tuesday : High near 113°F, overnight low near 90°F
- Wednesday : High near 114°F — the peak of the heat event
- Thursday : High near 113°F
The Arizona Department of Health Services has also issued an Extreme Heat Warning for Gila, La Paz, Maricopa, Pinal, and Yuma counties through 8 p.m. Thursday, and separate warnings for Coconino, Graham, Greenlee, and Pima counties with daytime highs expected to reach up to 117°F in some lower-elevation locations.
Free cooling centers, hydration stations, and transportation assistance are available throughout Maricopa County. Residents can reach resources by calling 2-1-1.
Where the Risk Is Highest
The most dangerous conditions are in the lower-elevation areas of the Phoenix metro — including central Phoenix, south Phoenix, West Valley suburbs, and communities along the I-10 and I-17 corridors. At lower elevations, radiant heat from asphalt, concrete, and sun-baked surfaces can push the "feels like" temperature significantly above ambient air temperature.
Maricopa County Department of Public Health data shows that heat deaths in the county are concentrated among:
- People experiencing homelessness
- Older adults living alone without reliable air conditioning
- Outdoor workers, including construction crews, landscapers, and agricultural workers
- People with limited transportation access to cooling centers
The Maricopa County heat surveillance dashboard tracks confirmed deaths and deaths under investigation on a weekly basis throughout the heat season (May through October). The 2026 dashboard notes that confirmed deaths are tracking higher than at the same point in 2025 — and heat kills more Americans each year than any other weather-related event.
The NWS notes that collaborative research with the CDC shows heat-associated deaths in Arizona can occur at temperatures as low as the mid-80s, meaning even days that feel manageable can be dangerous for vulnerable individuals.
What Doctors and Experts Say
Maricopa County Department of Public Health (MCDPH) has been explicit in its guidance: call 2-1-1 to access free cooling centers, transportation, water, and other resources in Maricopa County.
The county emphasizes that heat affects everyone differently — and that certain individuals face critically elevated risk even when the heat feels tolerable. MCDPH states on its official heat safety page: "Heat can affect anyone, but some people face higher risk. Knowing your risk helps you stay safe, even on days without official heat warnings. Factors like age, health conditions and certain medications, housing, and substance use can all increase vulnerability to heat."
The Arizona Department of Health Services advises: "Drink water, limit your time in the heat, and check on neighbors and family members. Visit air-conditioned public spaces like malls, libraries, or community centers to stay cool."
When the NWS issues an Extreme Heat Warning, it is a signal that "it is not 'business as usual,'" according to the NWS Phoenix Heat Page. The warning is specifically reserved for conditions where the heat risk level is categorized as "Major" or "Extreme" — meaning a broad population, not just vulnerable individuals, is at risk.
Who Faces the Greatest Risk?
Heat illness is universal at high enough temperatures, but certain populations face life-threatening risk at temperatures others might endure:
- Older adults — the body's thermoregulatory efficiency declines with age, and many seniors live alone and may not call for help
- Infants and young children — they cannot self-regulate heat effectively and depend entirely on caregivers to keep them cool and hydrated
- People experiencing homelessness — without access to air conditioning, shade, or hydration
- Outdoor workers — roofers, landscapers, construction workers, agricultural laborers who have no choice but to work in extreme heat
- People with chronic illness — including heart disease, kidney disease, diabetes, and respiratory conditions, all of which impair the body's response to heat stress
- People taking certain medications — including diuretics, antihistamines, beta-blockers, antipsychotics, and stimulants, which can impair sweating, thirst, or cardiovascular response to heat
- Athletes and people who exercise outdoors — who may push through heat symptoms until collapse
- People without air conditioning or with unreliable power access
Symptoms and Warning Signs to Watch For
Heat illness progresses along a spectrum. Recognizing the early signs can prevent progression to heat stroke, which is a medical emergency.
Heat cramps (early): Painful muscle cramps or spasms, usually in the legs or abdomen, often with heavy sweating.
Heat exhaustion (moderate): Heavy sweating, cold or pale and clammy skin, fast and weak pulse, nausea or vomiting, muscle cramps, weakness, dizziness, headache, and fainting. The person may feel extremely tired. Body temperature is still below 104°F.
Heat stroke (severe — CALL 911 IMMEDIATELY):
- Body temperature at or above 103–104°F
- Hot, red, dry, or damp skin
- Rapid, strong pulse
- Confusion, altered mental state, slurred speech, or loss of consciousness
- No sweating despite extreme heat (classic heat stroke) or heavy sweating (exertional heat stroke)
Heat stroke is a life-threatening emergency. Call 911 immediately. While waiting, move the person to a cool area, apply ice packs to the neck, armpits, and groin, and fan the person vigorously. Do not give fluids to someone who is unconscious or confused.
Never leave a child or pet in a parked vehicle in summer heat. Interior car temperatures can exceed 150°F within minutes of parking, regardless of outside air temperature.
What You Can Do Now
- Stay indoors during peak heat hours: 10 a.m. to 8 p.m. If you must go outside, limit time in direct sun and take frequent breaks in air-conditioned spaces.
- Drink water continuously — at least 8 ounces every 15–20 minutes during any outdoor activity. Do not wait until you feel thirsty.
- Find a cooling center if you do not have reliable air conditioning. In Maricopa County, call 2-1-1 for free cooling center locations, transportation assistance, and water access. Visit maricopa.gov/heat for locations.
- Check on neighbors, family members, and elderly relatives — particularly those who live alone, are over 65, or do not have air conditioning. A wellness check call or text can save a life.
- Never leave children, elderly adults, or pets in parked vehicles — even for a few minutes. Interior temperatures become dangerous within minutes.
- Know the signs of heat stroke and call 911 immediately if someone has a high body temperature combined with confusion, loss of consciousness, or very hot skin.
- Outdoor workers should follow OSHA heat safety guidance , take mandatory shade and hydration breaks, and tell supervisors immediately if feeling ill.
- Review your medications with a pharmacist or physician if you take diuretics, antihistamines, beta-blockers, or other medications known to affect heat tolerance.
Cost and Access: What Patients Should Know
Cooling centers in Maricopa County are free and open to all residents. No identification, insurance, or proof of residence is required. The Maricopa County Heat Relief Network includes community centers, churches, and other organizations that provide water, air-conditioned space, and connections to additional resources.
Transportation to cooling centers is available at no cost by calling 2-1-1. This service is particularly important for older adults and individuals without vehicles.
For people experiencing homelessness, the County also operates dedicated respite and cooling resources. Call 2-1-1 for referral.
Medical treatment for heat stroke at an emergency room may result in significant out-of-pocket costs for uninsured patients. The Health-e-Arizona Plus portal can help Arizona residents determine eligibility for Medicaid (AHCCCS), which covers emergency care at no cost.
What Happens Next
The Extreme Heat Warning for Maricopa County runs through 8 p.m. Thursday, July 9, 2026. The National Weather Service forecast shows no significant rain chances in the Phoenix Valley for the foreseeable future, though temperatures are expected to ease modestly into the weekend.
The Maricopa County heat surveillance dashboard is updated weekly and will reflect any heat-related deaths or hospitalizations associated with this week's event in its next update. The Arizona Department of Health Services will issue additional alerts if conditions warrant.
MedicalDaily will update this article if the warning is extended or if local health officials release data on heat-related illness during this event.
The Bottom Line
Phoenix is in the middle of a multi-day extreme heat event with temperatures forecast to reach 114°F — among the highest of the 2026 heat season so far. The same city recorded 430 heat deaths in 2025, and this week's conditions are dangerous enough to cause serious illness in unprotected individuals within 30 minutes of outdoor exposure.
Stay inside between 10 a.m. and 8 p.m. Drink water before you feel thirsty. Call 2-1-1 if you need a cooling center. Check on your neighbors. If someone shows signs of heat stroke — high body temperature, confusion, hot skin — call 911 immediately. This heat is survivable with the right actions. It is not survivable through inaction.
