Construction workers who perform physically demanding tasks outdoors are at risk of heat stress, particularly during hot and humid weather. Prolonged exposure to high temperatures can cause dehydration, heat cramps, heat exhaustion, and potentially life-threatening heatstroke. Employers should assess heat-related risks, provide easy access to drinking water, arrange shaded or cool resting areas, and schedule regular rest breaks. Where practical, heavy work should be planned for cooler parts of the day, and new or returning workers should gradually adapt to working in hot conditions.

Workers and supervisors should recognize warning signs such as excessive sweating, dizziness, headache, nausea, weakness, and muscle cramps. Anyone experiencing these symptoms should stop working and move to a cooler area for prompt assessment. If heatstroke is suspected, call emergency medical services immediately and begin rapid cooling while awaiting help. Workers should also look out for one another, especially during heatwaves. Effective hydration, suitable work-rest schedules, heat awareness training, and prompt medical response help protect construction workers from heat-related illnesses.