How Do You Prepare for Hiking in Hot and Humid Weather?

Hiking · Hiking, trekking and nature · 2 min read · Researched guide · Last updated 2026-10-23

In short: Hot, humid weather raises the risk of heat illness. Acclimatise gradually, hike early, drink enough fluids and electrolytes, wear loose clothing and rest in shade. Heat exhaustion can progress to heat stroke, a medical emergency marked by body temperature above 40 C and impaired awareness.

Quick facts

Why humidity matters

Sustained high temperature and humidity are the main risk factors for heat illness. Older adults, very young children, people who are unwell or overweight and some people on medications are at greater risk.

Prepare

• Acclimatise gradually; do not jump to a long hike in a heatwave.
• Start early and finish before midday heat.
• Drink fluids and electrolytes regularly.
• Wear loose-fitting, light clothing, a hat and sun protection.
• Choose shaded routes and plan rest stops; see the packing list.

Know the signs

Heat exhaustion brings heavy sweating, fast weak pulse, headache, nausea, dizziness and muscle aches, with thinking intact. Heat stroke is more severe: body temperature above 40 C, dry skin, impaired awareness. Treat suspected heat stroke as a medical emergency.

First response

Move the person to shade, lie them down, cool them and give fluids if they are alert. Seek urgent help if awareness is impaired (dial 112). Review first-aid and emergency planning and check the forecast; postpone in extreme heat.

Check before you go

This is a researched guide, not medical advice. Rules, permits, closures and fees change. Confirm locally before you travel.

Frequently asked questions

Read next

Rules, closures, fees and conditions change. Confirm with the relevant authority before you travel, and treat this guide as planning help, not a substitute for local advice.