May 2026 has already broken temperature records across Europe, with parts of Spain, France, and Italy seeing temperatures more typical of August. Climate scientists warn this is a preview of what's coming β€” and the United States is bracing for what could be one of the hottest summers on record.

Heat is the #1 weather-related killer in the United States, causing more deaths annually than hurricanes, tornadoes, and floods combined. Yet heat-related illness is almost entirely preventable. Here's everything you need to know to stay safe.

Understanding the Danger: Why Heat Kills

Your body maintains an internal temperature around 98.6Β°F (37Β°C). When external temperatures rise above body temperature, your cooling system β€” primarily sweating β€” must work overtime. When it can't keep up, core body temperature rises, and organs begin to fail.

The real danger isn't just air temperature β€” it's the heat index, which combines temperature and humidity. At 90Β°F with 70% humidity, it feels like 106Β°F, and your body simply cannot cool itself through sweating effectively.

Know the Warning Signs

Heat Exhaustion (Act Immediately)

  • Heavy sweating
  • Cold, pale, and clammy skin
  • Fast, weak pulse
  • Nausea or vomiting
  • Muscle cramps
  • Tiredness or weakness
  • Dizziness or headache
  • Fainting

What to do: Move to a cool place. Loosen clothes. Apply cool, wet cloths or take a cool bath. Sip water. Seek medical help if vomiting or symptoms worsen or last longer than one hour.

Heat Stroke (Call 911 β€” This Is a Medical Emergency)

  • Body temperature of 103Β°F or higher
  • Hot, red, dry, or damp skin
  • Fast, strong pulse
  • Headache, dizziness, nausea
  • Confusion or losing consciousness
  • Key difference: You may STOP sweating β€” this is a critical danger sign

What to do: Call 911 immediately. Move the person to a cooler place. Help lower their temperature with cool cloths or a cool bath. Do NOT give the person anything to drink if they're confused or unconscious.

12 Essential Heat Safety Tips

  1. Hydrate before you're thirsty: By the time you feel thirsty, you're already mildly dehydrated. Aim for at least 8-12 glasses of water daily during extreme heat, more if you're active
  2. Avoid alcohol and caffeine: Both are diuretics that accelerate fluid loss. Save the cold beer for the evening when temperatures drop
  3. Wear light, loose, light-colored clothing: Dark colors absorb heat. Tight clothes prevent sweat evaporation. Cotton and moisture-wicking fabrics are best
  4. Limit outdoor activity to morning and evening: The most dangerous hours are 10 AM to 4 PM. If you must exercise outdoors, do it before 8 AM or after 7 PM
  5. Never leave anyone in a parked car: Car interiors can reach 140Β°F+ within minutes, even with windows cracked. This kills dozens of children every year
  6. Use sunscreen: Sunburn impairs your body's ability to cool itself. Apply SPF 30+ broad-spectrum sunscreen 15 minutes before going outside
  7. Know your medications: Many common medications increase heat sensitivity β€” including blood pressure pills, antihistamines, antidepressants, and stimulants. Talk to your doctor
  8. Check on vulnerable people: The elderly, young children, people with chronic illnesses, and those without air conditioning are at highest risk. Check on neighbors and family members
  9. Create a cool room: If you don't have AC, use fans with wet towels, close blinds on sun-facing windows, and visit public cooling centers during peak heat
  10. Eat light meals: Heavy, protein-rich meals generate more metabolic heat. Opt for fruits, salads, and cold soups during heat waves
  11. Acclimate gradually: If you're not used to heat, increase exposure slowly over 7-14 days. Your body adapts, but it needs time
  12. Know your local resources: Most cities open cooling centers during extreme heat events. Libraries, community centers, and malls also provide free air-conditioned refuge

Protecting Your Home

Energy-efficient cooling can save both your health and your electricity bill:

  • Close blinds and curtains on south- and west-facing windows during the day β€” this alone can reduce indoor temperature by 5-10Β°F
  • Use fans strategically: Ceiling fans should run counterclockwise in summer. Box fans in windows work best at night, pulling cool air in
  • Cook outside or use microwave: Ovens generate tremendous heat. Grilling outside or using a microwave keeps your kitchen cooler
  • Seal air leaks: The same weatherstripping that keeps cold out in winter keeps cool air in during summer
  • Set AC to 78Β°F when home: Every degree below 78Β°F increases energy use by 3-4%. Use a programmable thermostat to raise it when you're away

Special Considerations for Exercise

Athletes and outdoor workers face elevated risks:

  • The 2-hour rule: Reduce intensity and duration of outdoor exercise when the heat index exceeds 90Β°F. Cancel outdoor exercise above 105Β°F heat index
  • Pre-hydrate: Drink 16-20 oz of water 2-3 hours before outdoor activity
  • Sports drinks matter: For activity lasting over 60 minutes in the heat, electrolyte-containing drinks help replace sodium lost through sweat
  • Buddy system: Never exercise alone in extreme heat. Heat stroke can cause confusion, making it impossible to help yourself
  • Wet bulb globe temperature (WBGT): This is the gold standard for exercise safety. Many weather apps now include it. Activity should cease above 90Β°F WBGT

Climate Context: Why It's Getting Worse

Heat waves are becoming more frequent, longer, and more intense due to climate change. Key facts:

  • The number of extreme heat days in the US has doubled since the 1960s
  • Urban areas experience "heat island" effects that can be 5-10Β°F warmer than surrounding areas
  • Nighttime temperatures are rising faster than daytime highs, reducing the body's recovery window
  • By 2050, the number of Americans exposed to dangerous heat levels could triple

The Bottom Line

Heat kills silently and quickly. Unlike a hurricane or tornado, there's no dramatic warning β€” just gradually rising temperatures and a body that quietly overheats. The good news is that almost every heat-related death is preventable with basic precautions.

Stay hydrated, stay cool, check on loved ones, and take the heat seriously. Your body will thank you.

Sources & Medical Accuracy Note

This article is educational and is not a substitute for professional medical advice. Health recommendations can vary by age, medical history, pregnancy status, medications, and individual risk factors. Consult a licensed clinician before changing treatment, diet, exercise, supplement, or sleep routines.