The National Weather Service warns that hot conditions up to 100 degrees will now be present for the San Diego County Valleys until Saturday, 7/29/23 at 7:00 p. m. , up to 117 degrees in the San Diego County Deserts and up to 100 degrees in the San Diego County Mountains today until Saturday, 7/29/23 at 8:00 p. m. * Stay inside or in shaded areas. * Drink lots of water. * If you feel sick from the heat, call 9-1-1. * Never leave young children or pets alone in vehicles. Find a cool place to go and tips to beat the heat at www. coolzones. org . Visit the National Weather Service for more information, updates, and a map.