If you’ve lived in Phoenix for more than one summer, you already know — the heat here isn’t just uncomfortable, it’s a genuine medical hazard. But knowing something is dangerous and actually knowing what to do about it are two different things.
This post is for Phoenix families who want practical, honest guidance on keeping kids and adults safe from May through September. No fluff, no generic advice you’ve seen a hundred times. Just what you actually need to know, from a family medicine practice that’s right here in the Valley with you.
The Reality of Phoenix Summer Heat
Let’s start with the facts, because they matter.
In 2024, Phoenix experienced 113 consecutive days of temperatures at or above 100 degrees — the longest run ever recorded. The previous record, set in 1993, was 76 days. Arizona Mirror
Maricopa County recorded 602 heat-linked deaths in 2024, down slightly from the record-breaking 645 in 2023 — and those 2023 numbers made up more than half of all heat-related deaths reported nationally that year. AZFamily
Approximately 4,298 people visit Arizona emergency rooms every year because of heat-related illnesses. Arizona Department of Health Services
These aren’t statistics to scare you — they’re context. Phoenix summers demand real preparation, not just a cold water bottle and good intentions.
Know the Difference: Heat Exhaustion vs. Heat Stroke
This distinction can literally save someone’s life, especially with kids who can’t always tell you how they’re feeling.
Heat exhaustion is the warning shot. Symptoms include pallor — an unhealthy pale appearance — weakness, headache, nausea, muscle cramps, or fainting. If you notice any of these signs, even subtle ones, cool your child off and have them drink extra fluid right away. Children’s Hospital of Philadelphia
Heat stroke is the emergency. Symptoms of heat stroke include high fever, flushed skin, and confusion or loss of consciousness. This condition warrants a call to 911. Children’s Hospital of Philadelphia
The key difference: heat exhaustion is something you can treat on the spot with shade, fluids, and cooling. Heat stroke is a 911 situation, full stop. Don’t try to wait it out.
Teen athletes who often practice during the hottest parts of the day also need special attention. Sometimes athletes start to feel nauseous or have a little bit of a headache from the heat and want to push through — but the longer they push through, the worse symptoms can become. Teach your kids that speaking up about symptoms is never weakness. Children’s Hospital Colorado
Practical Tips for Phoenix Families
Time Your Outdoor Activities Carefully
This is the single most effective thing you can do. Plan errands and recreational activities for the early morning and evening, and avoid being outside from 10 a.m. to 4 p.m. when the sun is at its most intense. honorhealth
It also takes time to adjust. Acclimatizing to high summer temperatures can take 8 to 10 days — so if your family is returning from a cooler vacation or you’re new to Phoenix, give yourselves a gradual on-ramp to outdoor activity. Nebraska Medicine
Hydrate Aggressively — Before You’re Thirsty
Thirst is a late signal. By the time a child says they’re thirsty, they’re already behind on fluids. Phoenix Children’s Hospital recommends that when out with your kids, make sure they drink 16 ounces of water every four hours. Taking water breaks every 15 to 20 minutes and encouraging kids to keep drinking even if they don’t feel thirsty is important. Clear urine is generally a good sign of adequate hydration. City of PhoenixNebraska Medicine
For kids doing sports or intense outdoor activity, electrolyte drinks can help replace what’s lost in sweat. Plain water is fine for general daily hydration, but during heavy activity, some sodium and electrolytes matter too.
Never Leave a Child in a Parked Car
This cannot be overstated. Temperatures inside a parked car can reach between 131 and 172 degrees within just 15 minutes. Studies show that cracking the windows does not make a meaningful difference in keeping a car cool enough — and in cases where a child is left in a hot car, even 75-degree outside temperatures can send interior car temperatures to 125 degrees in less than an hour. City of Phoenix + 2
Not even for a quick errand. Not even for a minute.
Watch the Pavement
This one is specific to Phoenix and it catches people off guard. Asphalt on Arizona’s streets can reach up to 180 degrees Fahrenheit during summer months, and once outside temperatures surpass 95 degrees, the risk of pavement burn increases significantly for bare skin contact. AZ Humane
Teach your children to wear shoes outside — concrete can be hot enough to cause second-degree burns. Check metal playground equipment before letting young kids touch it. Check the temperature of car seat buckles, which can reach the temperature of a hot skillet, and park in covered or shaded parking whenever possible. honorhealthhonorhealth
Protect Your Skin from the Sun
Sunburn isn’t just a cosmetic issue — it damages your skin’s ability to regulate temperature, making heat illness more likely. Make sunscreen part of your morning routine, and lather kids up before dressing them to ensure they’re covered even if you’re not around water. Reapply every two hours if you’re spending time outside, and don’t forget ears, the back of the neck, and the tops of feet. honorhealth
Know Your Cooling Resources
The City of Phoenix maintains 17 library locations as cooling centers throughout the heat season, and 46 city facilities served as hydration stations in 2024 — all listed on a publicly accessible map and directory. Phoenix also opened a 24/7 heat respite center in 2024 and plans to expand capacity in 2025. City of Phoenix
If your AC goes out or you’re experiencing any kind of housing instability during summer, these resources are there — and they’re free. Visit phoenix.gov/summer for current locations and hours.
Who Is Most at Risk
While the heat affects everyone, some groups are especially vulnerable:
Babies are less able to sweat when hot, and obese children also have a decreased ability to release heat. Children with asthma, cystic fibrosis, or other lung conditions may be more likely to struggle in extreme heat, as may children born prematurely and those who take stimulant medications. Children’s Hospital ColoradoChildren’s Hospital Colorado
Older adults are also at high risk — a majority of heat-related indoor deaths in Maricopa County involve people 50 years and older, and without air conditioning, the average temperature of homes can reach 100 degrees or higher. AZFamily
If someone in your family falls into one of these categories, summer planning requires extra attention and proactive conversations with your provider.
A Note on “Moderate” Heat Days
One thing the data consistently shows that surprises people: over half of all heat-related deaths in 2024 occurred on days of “moderate” heat risk — not the extreme days that make headlines. The cumulative effect of days that feel merely hot — not record-breaking — can be just as dangerous for vulnerable people. Governing
Don’t let a “normal” Phoenix summer day catch you off guard.
When to See Us
You don’t need to end up in the emergency room to warrant a conversation with your primary care provider about heat. Come see us at Thunderbird Family Medicine if:
- Someone in your household experienced heat exhaustion, even if they recovered
- Your child has a condition that could make them more heat-sensitive
- You’re managing a chronic condition like heart disease, diabetes, or kidney disease that can be affected by summer heat and dehydration
- You just want a game plan for keeping your family safe this summer
We know Phoenix summers. We’re here all year, and we’re glad to help you navigate them.
Schedule an appointment with Thunderbird Family Medicine — your Phoenix family health partner through every season.
This content is for educational purposes and is not a substitute for individualized medical advice. If you believe someone is experiencing heat stroke, call 911 immediately.