If you’re Travelling During a Heat Wave, don’t do these 6 things

Extreme heat has become a recurring travel issue across the U.S., with the National Weather Service issuing heat advisories and excessive heat warnings in multiple states each summer. If you’re on the road or catching a flight during a heat wave, federal safety guidance points to six mistakes that can quickly raise the risk of heat illness.

1. Don’t leave people or pets in a parked car

The National Highway Traffic Safety Administration says a vehicle’s interior temperature can rise by about 20 degrees in 10 minutes, even when a window is cracked. That makes a quick stop at a gas station or rest area riskier than many travelers realize during a July heat wave.

The Centers for Disease Control and Prevention says heat stroke can begin when body temperature reaches 103 degrees. In states like Arizona, Texas, and Nevada, summer air temperatures regularly top 100 degrees, which can push car interiors far beyond that threshold in a short time.

2. Don’t start a long drive without checking your car

AAA has repeatedly warned that extreme heat is hard on batteries, tires, and engines, especially during peak summer road trip months. In a 2024 summer travel advisory, AAA said dead batteries, tire failures, and overheating are among the most common heat-related breakdown issues.

The Federal Highway Administration also advises drivers to check coolant levels, tire pressure, and air conditioning before long trips. On interstates in states like California and Florida, a breakdown in afternoon heat can leave travelers exposed to dangerous conditions while waiting for roadside help.

3. Don’t ignore heat alerts at your destination

The National Weather Service issues both Heat Advisories and Excessive Heat Warnings, and those alerts can vary by city and county. A traveler heading to Las Vegas, Phoenix, or parts of inland California may face far different conditions than someone staying near the coast on the same day.

NOAA advises people to adjust outdoor plans when heat index values rise, because humidity can make the body feel much hotter than the air temperature alone. In the Southeast, including Florida and Louisiana, a heat index above 105 degrees is not unusual during summer surges.

4. Don’t wait until you’re thirsty to drink water

The CDC says thirst is not the earliest sign of dehydration, which is why regular fluid intake matters during travel days. Long TSA lines, airport delays, and hours in a car can make it easy to go too long without water, especially during busy summer weekends.

The agency advises drinking more fluids when temperatures are high, while also noting that alcohol can contribute to dehydration. At large airports such as Hartsfield-Jackson Atlanta or Dallas Fort Worth, travelers may spend several hours moving between terminals, parking, and transit in high heat.

5. Don’t plan strenuous sightseeing in peak afternoon heat

The Occupational Safety and Health Administration recommends more rest, shade, and water during high-heat periods, especially for people not yet acclimatized. That matters for travelers who arrive in hot-weather cities and immediately start hiking, walking tours, or theme park visits on day 1.

In places like Orlando, Las Vegas, and Phoenix, afternoon highs can remain above 95 degrees for hours in July and August. The CDC says heat exhaustion can include dizziness, heavy sweating, nausea, and weakness, all of which can escalate if a person stays active in direct sun.

6. Don’t overlook medication, age, or health risks

The CDC says older adults, young children, and people with heart disease are among those at higher risk during extreme heat. Certain medicines, including some for blood pressure or allergies, can also affect hydration or temperature regulation, according to federal public health guidance.

For travelers managing a chronic condition, heat risk is not the same as it is for a healthy adult in their 20s. The National Weather Service has said repeatedly in summer safety messaging that the most dangerous heat impacts are often preventable when people plan around the forecast and their own health needs.