000 FXUS66 KSGX 282052 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 152 PM PDT Sat Jun 28 2025 .SYNOPSIS... High temperatures will warm a few to around 5 degrees this weekend with high temperatures within a few degrees of average to around 5 degrees above average. High temperatures will then cool about 5 degrees through the middle part of next week with high temperatures on Thursday around average to around 5 degrees below average for the valleys. The marine layer lowers some this weekend, but lifts again early next week, with night and morning coastal low clouds spreading into the western valleys, clearing by the mid-late mornings. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... A warm and dry weekend is on tap as the subtropical ridge axis stretches over southern California. This is resulting in temperatures across the inland valleys reaching the upper 80s to low 90s in the San Diego county valleys and the mid to upper 90s for the Inland Empire, while the deserts see highs 105-110. While these temperatures are only about 5 degrees above average for the inland valleys, today/Sunday will still feature the hottest temperatures of the week as the ridge retreats eastward. A fairly stagnant upper level pattern is then established late Sunday with the ridge now in place across the Four Corners and a cut-off low centered about 200- 300 miles off the coast of California. This pattern persists through mid-week when the trough slides eastward over California on Wednesday into Thursday. Through this stagnant pattern, the deserts stay hot Monday into Tuesday while the inland valleys are a little cooler. Still, the deserts very slowly cool Monday through Wednesday. The pattern begins to grow more uncertainty Thursday through the end of the week. Within this uncertainty, what appears more certain is the increase in monsoonal activity, although staying east of SoCal. && .AVIATION... 282100Z....Coast/Valleys...VFR conditions this afternoon. Low clouds based 700-1200 ft MSL redevelop and push inland tonight up to 5-10 miles with similar or slightly lower bases generally after 04z. Areas of 1-5SM visibility for western valleys and higher coastal terrain. Locally below a mile 11-14z Sun. Clearing 15-17z. .Mountains/Deserts...SW/W wind gusts 25-35 kts across the deserts and mountain passes this afternoon and early evening leading to MOD UDDFS at times. Winds weaken substantially by 06z Sunday. && .MARINE... Periods of gusty northwest winds around 15 to 18 knots possible in the outer coastal waters near San Clemente Island this afternoon and evening. Otherwise, no hazardous marine conditions are expected through Wednesday. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ PUBLIC...Munyan AVIATION/MARINE...Westerink