Extreme Heat in 2026: How to Protect Children, Pets, and Older Adults When the Temperature Climbs

The summer of 2026 has arrived with force. A massive heat dome has pushed dangerous temperatures across a huge share of the country, and forecasters expect the heat to keep coming. For most of us, a brutal heat wave means an uncomfortable few days and a higher electric bill. For the very young, for older adults, and for our pets, the same heat can be a medical emergency or worse.

This guide pulls together what the 2026 season actually looks like, who is most at risk, and the specific steps that prevent heat tragedies. It closes with the one factor that ties all three groups together: cooling equipment that actually works when the heat is at its worst. If your air conditioning is older, undersized, or unreliable, now is the time to fix that. You can browse dependable, properly sized air conditioners at AC Direct.

This is not a quiet summer. In mid June 2026, AccuWeather reported that a dangerous heat wave was set to affect roughly 170 million Americans, with daytime highs approaching and exceeding 100 degrees Fahrenheit across more than three dozen states from the Plains to New England. The National Weather Service issued widespread "dangerous" heat warnings, with heat index values forecast as high as 110 degrees in parts of Texas.

A few details make this event stand out:

• The nights are not cooling off. AccuWeather noted that Newark, New Jersey, and Philadelphia were both forecast to see three consecutive nights with low temperatures at or above 80 degrees, something that has never happened in June in either city. Warm nights matter more than people realize, because the body relies on cooler overnight hours to recover.
• It is severe by historical measure. For Chicago and New York, the AccuWeather HeatWave Severity Index indicated the spell would be worse than any recorded since that scale began in 2023.
• The season ahead stays hot. AccuWeather's 2026 summer outlook calls for above average heat across most of the contiguous United States, with the worst focused on the West and Northwest, and a near or above average number of 90 degree days in Boston, Chicago, New York City, and Philadelphia. A developing El Nino is expected to shape the pattern through the rest of the year.

The takeaway is simple. This is a widespread, long, and intense heat season, and the people around you who are most vulnerable will be tested repeatedly, not just once.

There is a common assumption that the deadliest heat comes in the dog days of late July and August. The data says otherwise. Researchers at Harvard note that heat tends to cause more deaths at the start of summer than at the end, and that more deaths occur when heat strikes areas that are not used to it. The National Weather Service has made the same point this year, warning that an early season heat wave can be more dangerous because people have not yet acclimated.

Acclimation is the key word. It takes the human body a couple of weeks of gradual exposure to adjust its sweating and circulation to high heat. A 98 degree day in June, before anyone has adapted, can be harder on the body than a hotter day in August. That is exactly why the June 2026 event deserves serious attention for the people in your life who cannot adapt easily, including infants, older adults, and pets.

Before getting into the three vulnerable groups, everyone in a household should be able to tell these two conditions apart, because the response is different and minutes matter.

The single most important fact about children and heat is biological. The NHTSA reports that a child's body temperature rises three to five times faster than an adult's. Heatstroke in the body begins at a core temperature of about 104 degrees, and death can occur at 107 degrees or above. A child can reach those temperatures astonishingly quickly.

Vehicular heatstroke is the leading cause of non crash vehicle related death for children in the United States. The numbers are sobering:

• The NHTSA reports that 31 children died of vehicular heatstroke in 2025, down from 39 in 2024. On average, about 37 children die this way each year, and 2018 and 2019 each set a record of 53 deaths.
• More than 1,000 children have died in hot cars since 1998. During the summer, that works out to roughly two children every week.
• The National Safety Council reported six such deaths already in 2026 at the time of writing, a reminder that the season is underway.

A car becomes a death trap with frightening speed. The NHTSA notes that the temperature inside a vehicle can rise to over 115 degrees even when it is only 70 degrees outside, and that interior temperatures can climb to 50 degrees hotter than the air outside. Cracking the windows or parking in the shade does very little to change this.

It is tempting to believe this could never happen in your family. The data shows the opposite. The NHTSA reports that about 52 percent of pediatric hot car deaths happen because a caregiver forgot the child was in the vehicle, and in roughly 47 percent of those cases the caregiver had intended to drop the child at daycare or preschool. A change in routine, an extra errand, or a quiet sleeping baby is often all it takes. A separate quarter of these deaths involve children who climbed into an unattended vehicle on their own and could not get out.

The NHTSA's campaign reduces it to three words: Stop. Look. Lock.

If this article does one thing, let it be this. Please check on the older adults in your life during this heat wave. Older Americans are, by a wide margin, the people most likely to die when temperatures spike, and many of those deaths are preventable with a single phone call or a knock on the door.

The pattern is consistent across decades of research:

Aging reduces the body's ability to shed heat. As the National Institute on Aging and CDC explain, older bodies do not dissipate heat as efficiently, older adults are more likely to have chronic conditions like heart disease and diabetes that heat makes worse, and many take medications that interfere with the body's ability to cool itself. Beta blockers, diuretics, and calcium channel blockers are common examples. On top of the biology, social isolation and limited mobility mean an older person may be unable to get to a cooler place or to ask for help.

You do not need to be a medical professional to save a life here. During a heat wave, do the following:

• Make contact at least once a day. Call, text, or better yet visit older relatives and neighbors who live alone. Heat illness can impair judgment, so a person in trouble may not recognize it or reach out.
• Confirm the cooling is actually working. Do not just ask if they are comfortable. Step inside and feel the air. Is the air conditioner running? Is the home genuinely cool, or just less hot? Is a window unit blowing cold air or struggling? Is the thermostat set to a safe temperature rather than turned up to save money?
• Watch for warning signs. Confusion, dizziness, a flushed face, weakness, or a person who has stopped sweating in the heat all warrant immediate action. When in doubt about heat stroke, call 911.
• Remove the barriers you can. If the home is too warm, help them get the system serviced, set the thermostat to a safe level, close blinds against direct sun, and make sure they are drinking water. If cost is the obstacle, look into local utility assistance and cooling center programs.
• Have a backup plan. Know where the nearest cooling center is, and arrange a place they can go if their cooling fails.

This is not a new idea. During a deadly 2012 heat event, Ohio launched a "Check on Your Neighbor" campaign and a "Knock and Talk" effort, and National Guard teams went door to door to check on older and isolated residents. Communities organize this for a reason. The most effective intervention in a heat wave is another person showing up.

It is also worth remembering that not every home is equipped for this. In Maine, which has the highest share of residents over 65 in the country, only about half of homes have air conditioning, compared with a national average near 90 percent. An older relative in a cooler climate may have no real cooling at all when an unusual heat wave hits.

Pets cannot tell you they are overheating, cannot open a door, and cannot turn on the air conditioning. They depend entirely on us.

Cornell University's veterinary college explains that dogs have sweat glands only on their paws, so their main way to cool down is panting. That makes them far more sensitive to heat than people. A dog's normal temperature runs from about 99 to 102.5 degrees. The American Kennel Club notes that a temperature over 104 signals heat stress, over 105 is heat exhaustion, and over 106 is heatstroke that needs emergency veterinary care.

Some animals are at even higher risk: flat faced or brachycephalic breeds like bulldogs, pugs, and boxers cannot pant efficiently, and overweight pets, older pets, puppies and kittens, dark coated animals, and those with heart or breathing conditions all struggle more in heat.

The same physics that endanger children endanger pets. Cornell notes that even when it is only 70 degrees outside, the inside of a car can rise by 40 degrees within an hour, and cracking the windows does not meaningfully help. The animal protection group FOUR PAWS reports that at a mild 68 degrees outside, a car's interior can reach about 99 degrees in 30 minutes and roughly 115 degrees within an hour. There is no safe way to leave a pet in a parked car in summer.

This is one of the most overlooked hazards. The pavement is far hotter than the air. Veterinary and safety sources report that asphalt can reach about 130 degrees when the air is just 85 degrees, and PETA notes that on an 87 degree day asphalt can hit 140 degrees, hot enough to burn a dog's paw pads within a minute. In the desert Southwest, the Arizona Humane Society reports that Valley asphalt can climb as high as 180 degrees in summer.

The test is easy: place the back of your hand on the pavement for about seven to ten seconds. If it is too hot for your hand, it is too hot for your dog's paws. Walk pets in the early morning or evening, stick to grass and shade, bring water, and on the worst days keep them inside.

• Provide constant access to shade and fresh, cool water, and on extreme days keep pets indoors with air conditioning or fans.
• Avoid strenuous exercise during the hottest part of the day, generally late afternoon, and during early season heat before pets have adjusted.
• Know the warning signs of heatstroke in dogs: heavy panting, drooling with thick saliva, bright red or bluish gums, weakness, vomiting, confusion, and collapse.
• If a dog overheats, move it to a cool area and use cool, not ice cold, water on the body. The Oregon Humane Society advises cooling toward 103 degrees and then stopping, and getting to a veterinarian right away, because the effects of heatstroke may not show immediately.
• Many states make it illegal to tether a dog outside in the heat without water and shelter, and some jurisdictions close trails to dogs once temperatures hit 100 degrees.

Look closely at the three groups in this article and one factor connects them. Children, older adults, and pets cannot reliably cool themselves and depend on a working, well functioning cooling system in the home. The Phoenix finding makes the point starkly: most of the people who died indoors from heat already owned air conditioners. The equipment was off, inadequate, or broken.

So the most practical heat safety step you can take, beyond checking on the people and animals who need you, is to make sure the air conditioning they rely on is genuinely up to the job. That means:

• Service it before the worst heat, not during it. NOAA specifically recommends servicing your air conditioner before hot weather arrives. A unit that fails in the middle of a heat wave is dangerous, and replacement parts and technicians are hardest to get exactly when everyone needs them.
• Make sure it is the right size and in good condition. An undersized or aging system that cannot keep up will leave a vulnerable person in a home that is "less hot" but not safe.
• Have reliable cooling for the rooms that matter. A bedroom an older parent sleeps in, a nursery, or the room a pet stays in should be able to hold a safe temperature even on the hottest days.

If the cooling in your home, or in the home of someone you are looking after, is not ready for a summer like this one, AC Direct carries dependable air conditioning and cooling systems, including options well suited to cooling specific rooms and whole homes. Replacing a tired or failing unit before the next heat wave is one of the most direct ways to protect the people and pets who cannot protect themselves.

There is no single magic number, because humidity, acclimation, and individual health all matter. The heat index, which combines temperature and humidity, is a better guide than the thermometer alone. What is clear is that early season heat and warm overnight lows are especially risky, and that infants, older adults, and pets are vulnerable at temperatures that feel merely uncomfortable to a healthy adult.

At least once a day, and more often during the most extreme days. The goal is not only to confirm they are answering, but to verify that their home is actually cool and their cooling equipment is running properly.

Not necessarily. In one Phoenix study, 91 percent of people who died indoors from heat had air conditioners that were off, set too high, or broken. Owning a unit is not the same as having safe, working cooling. Check that it is on, set to a safe temperature, and actually cooling the space.

Dangerously hot, dangerously fast. The NHTSA reports interiors can exceed 115 degrees even when it is only 70 outside, and can run 50 degrees hotter than the air outside. Never leave a child or pet in a parked car, and cracking the windows does not solve the problem.

Place the back of your hand on the pavement for about seven to ten seconds. If you cannot hold it there comfortably, it is too hot for your dog's paws. Walk early in the morning or in the evening, and favor grass and shade.

Call 911 immediately. Move the person to a cooler place and cool them aggressively with cool water and cloths. Heat stroke is a medical emergency where minutes matter, and core temperature can climb past 106 degrees in 10 to 15 minutes.