Guides

Essential Guide to Heat Waves: Understanding and Protecting Yourself

June 17, 2026 · The Clime Team

Heat waves are prolonged periods of excessively hot weather, often with high humidity. They can pose significant health risks, especially to vulnerable populations. Understanding heat waves and implementing protective measures are crucial for safety.

What Are Heat Waves?

A heat wave is a prolonged period of excessively hot weather, often with high humidity. These conditions can lead to serious health issues, including heat-related illnesses. The risk of heat-related illnesses increases with prolonged exposure to high temperatures. (cdc.gov)

Who Is Most at Risk During Heat Waves?

Certain groups are more susceptible to heat-related illnesses:

Infants and Children: Their bodies are less efficient at regulating temperature.
Older Adults: Age-related changes can impair heat tolerance.
People with Chronic Health Conditions: Conditions like heart disease or respiratory issues can be exacerbated by heat.
Pregnant Women: Heat can affect both mother and fetus.
Individuals with Disabilities: May have limited ability to adapt to heat.

It's essential to monitor these groups closely during heat events. (cdc.gov)

What Are the Symptoms of Heat-Related Illnesses?

Heat-related illnesses can manifest in various ways:

Heat Exhaustion: Symptoms include heavy sweating, weakness, dizziness, nausea, and headaches.
Heat Stroke: A severe condition with symptoms like confusion, loss of consciousness, and a body temperature above 103°F (39.4°C).

Recognizing these symptoms early is vital for prompt treatment. (cdc.gov)

How Can You Protect Yourself During a Heat Wave?

Implementing preventive measures can significantly reduce the risk of heat-related illnesses:

Stay Cool: Use air conditioning or visit public places with AC. If unavailable, consider spending time in air-conditioned public places like malls or libraries. (cdc.gov)
Stay Hydrated: Drink plenty of water throughout the day. Avoid alcohol and high-sugar drinks. (cdc.gov)
Wear Appropriate Clothing: Opt for lightweight, light-colored clothing to reflect heat.
Limit Outdoor Activities: If possible, schedule outdoor activities during cooler parts of the day, such as early morning or evening.
Check on Vulnerable Individuals: Regularly check on family, friends, and neighbors who are at higher risk.

What Should You Do if You Suspect Heat-Related Illness?

Immediate action is crucial:

Move to a Cooler Place: Get the person to a shaded or air-conditioned area.
Hydrate: Offer cool (not cold) water to drink.
Cool the Body: Apply cool, wet cloths to the skin or immerse the person in cool water.
Seek Medical Attention: If symptoms are severe or worsen, call emergency services immediately.

How Can You Stay Informed About Heat Events?

Staying informed helps in taking timely precautions:

Monitor Local Weather Reports: Stay updated on heat advisories and warnings.
Use Heat Risk Tools: Utilize resources like the CDC's HeatRisk Dashboard to assess heat risks in your area. (cdc.gov)

How Does Climate Change Affect Heat Waves?

Climate change is contributing to more frequent and intense heat events:

Increased Frequency: Heat waves are becoming more common.
Higher Intensity: Temperatures during heat waves are rising.

Understanding these trends is essential for long-term preparedness. (cdc.gov)

How Can Communities Prepare for Heat Waves?

Community-level preparedness can save lives:

Establish Cooling Centers: Designate public places as cooling centers during heat events.
Public Education: Educate residents about heat risks and protective measures.
Emergency Plans: Develop and communicate heat action plans to ensure a coordinated response.

By understanding heat waves and taking proactive steps, individuals and communities can significantly reduce the health risks associated with extreme heat.

Highlights:

Tracking Heat Events | Tracking Program | CDC, Published on Tuesday, May 05
Temperature Extremes | Climate and Health | CDC, Published on Friday, March 01