Residents and visitors in Las Vegas should prepare for potentially extreme heat conditions on August 21, 2026. High temperatures exceeding 105°F (40.6°C) can pose significant health risks, particularly for vulnerable populations such as the elderly, children, and those with pre-existing health conditions. Prolonged exposure to such heat can lead to dehydration, heat exhaustion, or heat stroke. Outdoor activities during peak heat hours may become hazardous, and infrastructure such as power grids could face increased strain due to elevated cooling demands.