As temperatures rise, the CDC reminds people working or exercising outdoors to drink fluids regularly, take breaks in shade, and watch for heat exhaustion symptoms — heavy sweating, weakness, cold pale clammy skin, nausea, or fainting.
How much water?
Individual needs vary with body size, sweat rate, and activity. A practical DIY starting point is our water intake calculator, which adjusts for weight and activity level. In hot weather, add extra fluid before outdoor sessions rather than chasing thirst afterward.
When to seek help
Heat stroke (confusion, hot dry skin, rapid pulse, loss of consciousness) is a medical emergency — call emergency services. Milder symptoms should prompt rest, cooling, and fluids; persistent vomiting or confusion needs urgent care.
Educational summary. Source: CDC heat illness guidance