The heat alert is expected to affect all residents in San Diego, with particular risks for vulnerable groups such as the elderly, children, and individuals with pre-existing health conditions. Prolonged exposure to high temperatures can lead to heat-related illnesses, including heat exhaustion and heat stroke. Those without access to cooling systems or air-conditioned spaces are at heightened risk. The city has taken proactive measures by opening cooling centers to reduce the potential for heat-related emergencies.