The heat advisory and extreme heat warning pose risks of heat-related illnesses, particularly for vulnerable populations such as the elderly, children, and those with pre-existing health conditions. Coastal and desert areas are expected to experience the most severe impacts, with high temperatures and humidity increasing the risk of dehydration and heat exhaustion. Dangerous rip currents along the coast also present hazards for swimmers and surfers. (NBC San Diego, Source time: 2026-07-27T07:35:15+00:00)