Temperatures 10-20 degrees above average will cause moderate to high HeatRisk for some inland areas. For the coastal areas: 76 to 86, western valleys and inland Orange County: 86 to 93, inland valleys: 89 to 97, mountains between 4000 ft and 7000 ft: 76 to 85, high desert: 91 to 96, low desert: 102 to 106.