The National Weather Service has extended the Heat Advisory for San Diego County Mountains and Valleys, until Sunday 9/12/21 at 9p. m. San Diego County Mountains and Inland Valleys will experience hot conditions. High temperatures of up to 98 degrees may be reached. Visit the National Weather Service for more information updates and a map. * Extreme heat increases the risk for heat-related illnesses and can affect those working or participating in outdoor activities. * Drink plenty of fluids, stay in an air-conditioned room if one is available, stay out of the sun and check up on relatives and neighbors by telephone, video call or in-person, while also following social distancing recommendations to prevent the spread of COVID-19. * Young children and pets should never be left unattended in vehicles at any time. * Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. * Know the signs and symptoms of emergencies like heat exhaustion and heatstroke, visit: www. sandiegocounty. gov/hhsa/programs/phs/extreme_heat . Several County facilities will be open as Cool Zones. For location information, hours of operation, and tips to beat the heat, visit: www. coolzones. org .