Another bump in temperatures for the weekend. Temperatures above average away from the coast. Map of forecast high temperatures for Saturday Dec 28, 2024. For the coastal areas: 63 to 69, western valleys and inland Orange County: 69 to 73, inland valleys: 69 to 74, mountains between 4000 ft and 7000 ft: 53 to 62, high desert: 62 to 66, low desert: 71 to 75.