Today will be slightly cooler than Friday, as much as 5 to 13 degrees below average for the mountains, inland valleys, and high desert. Highs temperatures on Saturday for San Diego County from the lower to mid 70s near the coast to the 80s for the inland valleys, for Orange County from the lower to 70s near the coast to the lower 80s inland, for the Inland Empire in the 80s, for the Apple and Lucerne Valleys in the upper 70s to upper 80s, for the lower deserts in the upper 90s to 103, and for the mountains for elevations from 4500 to 7000 feet in the 60s to mid 70s.