What to Wear in a Heat Wave: Extreme Heat Outfit and Safety Guide
Heat waves push temperatures and humidity into the danger zone. The right outfit — loose linen, wide-brim hat, hydration, electrolytes — is part of the safety strategy. Timing, shade, and AC access matter as much as fabric choice.
AT-A-GLANCE OUTFIT
Loose linen or technical sun shirt, lightweight linen or cotton trousers or shorts, breathable sandals or shoes, wide-brim hat with neck shade, polarized sunglasses, sunscreen, refillable water bottle with electrolyte tabs.
WHAT MAKES A HEAT WAVE DANGEROUS
A heat wave is sustained high temperature, often paired with high humidity, that prevents your body from cooling itself between outdoor exposures. Heat builds up over multiple days. Nighttime lows stay elevated. AC becomes critical, not optional.
Heat-related illness kills more Americans every year than any other weather event.
FABRIC PRIORITIES
Linen leads. Lightweight merino second. Technical sun fabrics for sustained outdoor activity. Lightweight cotton works but loads with sweat faster.
Avoid heavy denim, polyester suiting, dark colors, tight cuts.
CUTS AND COLORS
Loose. Drape. Light colors. Long sleeves of light fabric outperform bare arms in direct sun.
SUN PROTECTION
Wide-brim hat with neck flap. Polarized sunglasses. Sunscreen reapplied every 90 minutes. UPF 30+ sun shirt for sustained outdoor work.
HYDRATION AND ELECTROLYTES
Pre-hydrate (water before going out). Continuous hydration. Electrolytes for any activity over 30 minutes. Eat salty foods. Avoid alcohol and caffeine in extreme heat.
TIMING
Shift outdoor activity to dawn (6-9 a.m.) or dusk (7-10 p.m.). The 11 a.m. to 4 p.m. window is the most dangerous.
VULNERABLE POPULATIONS
Children, elderly, people on certain medications (diuretics, antihistamines, some antidepressants), people with chronic illness — all at elevated heat risk. Check on neighbors and family members during heat waves.
AC ACCESS
If your home does not have AC, identify cooling centers (libraries, malls, community centers) and plan to spend the hottest 4-6 hours of each day there.
WARNING SIGNS
Headache, dizziness, nausea, goosebumps in heat, sudden cessation of sweating, rapid heartbeat. Stop, get into AC or deep shade, hydrate with electrolytes, eat a salty snack.
Heat stroke (confusion, very high body temperature, hot dry skin) is a medical emergency. Call 911.
KEY TAKEAWAY
Heat waves are weather events, not just hot days. The right outfit (loose linen, sun protection) plus the right behavior (hydration, electrolytes, AC, timing) keeps you safe. The wrong combination is dangerous.