Forecast high temperatures for Saturday, Jul 26, 2025. Coolest day of the week! For the coastal areas: 68 to 75, western valleys and inland Orange County: 73 to 79, inland valleys: 77 to 85, mountains between 4000 ft and 7000 ft: 71 to 82, high desert: 82 to 95, low desert: 98 to 103.