Overview & Hydration Guidelines
High heat and humidity dramatically elevate fluid loss through sweat even during sedentary activities. Adequate fluid intake is essential to maintain performance, regulate body temperature, and offset fluid loss.
Frequently Asked Questions — Hot Climate & Summer Hydration Calculator
How much water should I drink in summer heat?
Increase daily baseline water intake by 20% to 35% when ambient temperatures exceed 30°C (86°F).
What are early warning signs of dehydration in high heat?
Dark yellow urine, dry mouth, dizziness, headache, muscle cramps, and decreased urination frequency.