Hydration during hot weather is crucial for maintaining body temperature and preventing heat-related illnesses such as heat exhaustion and heat stroke. High temperatures can lead to increased perspiration, which in turn can cause a significant loss of fluids and electrolytes. Staying hydrated ensures proper blood circulation and nutrient transport, which is essential for overall physical performance. Additionally, adequate hydration is important for cognitive function, as dehydration can impair focus and decision-making processes during strenuous activities or exercises in the heat.