The Texas Heat Playbook: staying safe when the thermostat won't let up
Texas summers are not just uncomfortable. Heat is the leading weather-related killer in the United States, and the state's overnight lows and urban heat islands make it harder for the body to recover. Here is how to plan a day that does not end in an emergency room.
Why Texas heat hits differently
Texas heat is not only about the daytime high. Two other numbers matter just as much: the overnight low and the humidity.
When the low stays at 80°F or above, the body never gets its nightly reset. Homes that cannot cool down store that heat, and people wake up already behind on hydration. In dense parts of Houston, Dallas, San Antonio, and Austin, asphalt and concrete keep surface temperatures far above the official air temperature — a pattern called the urban heat island effect.
Humidity is the second factor. The National Weather Service heat index combines temperature and humidity to estimate how hot it actually feels. At 90°F with high humidity, the index can cross 100°F, which puts outdoor work into the danger category. Sweat stops evaporating efficiently, so the body's main cooling system loses power.
The short version
- Schedule hard outdoor work before 10 a.m. or after 7 p.m., and take shade breaks every 30 to 45 minutes.
- Drink water steadily through the day instead of gulping it all at once. Add electrolytes if you sweat for more than an hour.
- Heat stroke is a 911 emergency. Confusion, hot skin, and a temperature at or above 103°F are the signals.
- Call 2-1-1 to find the nearest cooling center, utility assistance, or ride help.
Know the two heat illnesses
Heat illness sits on a spectrum. The difference between heat exhaustion and heat stroke is not how miserable someone feels — it is whether their brain is still working.
- Heat exhaustion: heavy sweating, weakness, cool or clammy skin, nausea, headache, dizziness, or fainting. Move the person to shade or air conditioning, loosen clothing, apply cool wet cloths, and sip water slowly.
- Heat stroke: a body temperature of 103°F or higher, hot or dry skin, confusion, slurred speech, agitation, seizure, or loss of consciousness. Call 911 immediately. While waiting, move the person somewhere cool and apply cold water or ice to the neck, armpits, and groin.
Do not wait for thirst
Thirst arrives after dehydration has already started. If your urine is dark yellow, you are behind. Clear or pale straw is the target.
Heat is the leading weather-related cause of death in the United States — and most of those deaths are preventable with shade, water, and a schedule.
Hydration that actually works
A simple baseline for a hot Texas day is roughly half your body weight in ounces of water, plus another 16 to 24 ounces for every hour of sweating. For a 180-pound adult, that is about 90 ounces before exercise.
Spread it out. Drinking a quart in ten minutes mostly sends you to the bathroom. Sipping 4 to 8 ounces every 15 to 20 minutes keeps absorption steady.
If you are outside for more than an hour and sweating heavily, replace sodium too. A sports drink, an electrolyte tablet in water, or a salty snack will do. For recreational activity, plain water plus normal meals is usually enough. Alcohol and heavy caffeine make things worse — save them for after the heat breaks.
Get the Texas Heat Playbook
One page. Print it, tape it to the fridge, and hand it to whoever needs it.
- Shade-break schedule by hour, ready to print
- Electrolyte replacement checklist for long days outside
- When to call 911 versus urgent care — one page
Plan the day around the sun
In most of Texas, the safest outdoor window from June through September is before 10 a.m. and after 7 p.m. If the work cannot move, rotate it: 30 to 45 minutes in the heat, then 10 to 15 minutes in shade or air conditioning.
Wear loose, light-colored, breathable fabric and a wide-brimmed hat. Sunscreen matters for burns, but it does not cool you down. Carry more water than you think you need, and tell someone where you are going.
Never leave a child or pet in a parked car, even for a minute, even with the windows cracked. On a 95°F day the interior can pass 115°F within an hour, and most of that rise happens in the first ten minutes.
Who needs a check-in
Some people absorb heat faster and cool down slower:
- Adults over 65 and children under 4, whose bodies regulate temperature less efficiently
- Outdoor workers, mail carriers, construction crews, farmworkers, and anyone in PPE
- People with heart, kidney, or lung conditions, and those taking diuretics, beta blockers, or antipsychotics
- People without reliable air conditioning, and anyone living alone
- Pets, especially flat-faced breeds and animals left outdoors
If you have neighbors who live alone, a text or a knock during a heat wave is genuine preventive care. Texas utilities cannot disconnect a customer for nonpayment during an extreme weather emergency, and assistance programs exist. Call 2-1-1 to ask about the Comprehensive Energy Assistance Program and local cooling centers.
When to get help
Call 911 for confusion, fainting, seizure, difficulty breathing, or a temperature at or above 103°F. For heat exhaustion that does not improve after 30 minutes in a cool space, call your clinician or visit urgent care.
If cost or insurance is the barrier, community health centers across Texas offer sliding-scale visits. The Texas Poison Center Network is available 24/7 at 1-800-222-1222 for questions about heat, medications, and hydration.
Educational, not medical advice
This guide is for general information. It does not replace an assessment from a clinician who knows your history. If something feels urgent, call your provider or 911.
