| Temperatures will rise and continue to build all week everywhere in San Diego County but particularly in the deserts, mountains and inland valleys. The hottest days are expected this weekend. The National Weather Service in San Diego has issued an excessive heat warning for inland mountains and deserts, that will likely extend into next week. CLICK HERE TO LEARN HOW TO IDENTIFY SIGNS OF HEAT ILLNESS, TO LEARN ABOUT THE COUNTY'S COOL ZONES, AND TO SEE TIPS ON HOW TO STAY COOL | 
