Staying Safe During a Heat Wave

Millions of Americans faced heat advisories before the July Fourth holiday. This happened as a major heat wave spread across the central and eastern United States in early July 2026. For many people, this is the time for cookouts, beach trips, and outdoor fun. Soccer fans packed into stadiums for World Cup matches. However, summer brings dangerous heat and humidity to many parts of America.

Hundreds of people get sick from heat each year in the United States. Older adults and people in areas that rarely get hot see the highest illness rates. Chicago saw this clearly in 1995. At least 700 people died in a heat wave that year. I study health risks in a warming climate as a public health professor. I have seen heat become a growing concern. Here are key warning signs to watch for. I will also share ways to stay cool when the heat gets too high.

Heat-related illnesses come in different levels of severity. Mild heat stress can quickly turn into life-threatening heat stroke. This happens if a person stays in dangerous conditions too long. Mild forms include heat cramps and heat rash. Both conditions come from heavy sweating in hot weather. Cooling the body and drinking cool fluids helps ease these symptoms.

When illness progresses to heat exhaustion, the situation becomes serious. Symptoms include dizziness, nausea, excessive sweating, weakness, thirst, and headaches. Heat exhaustion means the body is losing its ability to stay cool. Immediate action is needed. Move to a cool, air-conditioned space. Drink liquids, loosen your clothes, and use wet cloths. These steps can stop heat exhaustion from becoming heat stroke.

Heat stroke is a medical emergency. The body can no longer maintain a stable temperature. A body with heat stroke can reach 106 degrees Fahrenheit or higher very fast. This intense heat can damage the brain, heart, and kidneys. People with heat stroke often stop sweating. Their minds may fail, and they cannot help themselves. Heat stroke can cause seizures or coma. If not treated immediately, it can be fatal.

Because heat exhaustion can lead to heat stroke, acting early is vital. You must watch for signs of distress in yourself and others during extreme weather.

Heat risk is not just about temperature. Humidity also increases the risk of illness. Humidity makes sweating less effective at cooling the body. Do not just look at the temperature. Check the heat index instead. The heat index measures risk based on both temperature and humidity.

The heat index enters dangerous territory even without extreme heat. However, this measure is conservative. It is especially true for outdoor workers and athletes. Weather forecasts measure temperature in the shade. They do not measure direct sunlight. If you are in the sun, the actual heat can be 15 degrees Fahrenheit higher than the chart shows.

A more advanced measurement is the wet-bulb globe temperature. This includes wind speed and cloud cover. Neither the heat index nor the wet-bulb globe temperature accounts for physical activity. Working or playing sports raises your body temperature. Understanding these limits helps you gauge the true risk.

How can you stay cool? The answer depends on where you are. But the main points are the same. Avoid strenuous outdoor activities in high heat if possible. If you feel symptoms, drink hydrating fluids. Find shade and rest. Use cool, damp cloths to lower your temperature. If you see signs of heat stroke in someone else, call for help immediately.

Be careful with fans. Fans help if the temperature is not too high. They move sweat away from the body to cool it down. But at very high temperatures, fans can make heat buildup worse. If indoor temperatures reach 95 degrees Fahrenheit or higher, fans can be dangerous. They may increase the risk of illness. Seek other cooling methods in these cases.

Find a cooling center, library, or community center. Rest in an air-conditioned space during the hottest hours. Cities like Phoenix open cooling centers in summer. Northern cities are also opening them now. This trend shows that climate risks are changing across different regions.

Urban areas with many buildings and pavement are called heat islands. These areas trap heat and stay hotter than rural surroundings. Knowing your local microclimate helps you plan safer routes.

Hydrate, hydrate, hydrate! Drink plenty of fluids. Do not forget electrolytes. Heavy sweating removes water and salts from your body. Sports drinks can restore these levels. Proper hydration is one of the best ways to prevent illness.

Older adults and people with disabilities face higher risks. This is true if they cannot easily move to a cooler place. Neighbors and communities can help protect these vulnerable groups. Provide water and check on them regularly. Your community’s safety depends on looking out for its most vulnerable members.

Summer can be fun. Just remember the risks. Keep an eye on friends and neighbors when temperatures rise. Plan ahead to beat the heat. Preparedness and awareness are your best defenses.