Highs 15 to 25 degrees above average resulting in moderate to major HeatRisk for inland areas. For the coastal areas: 78 to 90, western valleys and inland Orange County: 91 to 97, inland valleys: 94 to 105, mountains between 4000 ft and 7000 ft: 78 to 88, high desert: 93 to 98, low desert: 103 to 108.