Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
198 FXUS66 KSGX 111105 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 305 AM PST Thu Dec 11 2025 .SYNOPSIS... Weakening offshore flow will transition to weak onshore flow with slow deepening of the marine layer through the weekend with a greater return of low clouds and fog to coastal areas for the weekend. Gradual cooling will spread inland through the weekend, but with weekend high temperatures still as much as 15 to 20 degrees above average for portions of the inland valleys and lower coastal slopes of the mountains. There will be slight warming on Monday followed by slight cooling for Tuesday and Wednesday. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .SHORT TERM (Today through Saturday)... High pressure aloft will slowly weaken into the weekend with weakening offshore lower-level flow becoming weakly onshore with slow deepening of the marine layer for Friday into the weekend. Early this morning, satellite imagery shows low clouds and fog remain well off the coast and beyond the offshore islands. Some patchy low clouds and locally dense fog could return near the coast tonight into Friday morning. However, increasing coverage and greater spread into coastal areas is more likely for Friday night into Saturday morning. Gradual cooling will spread inland for today into the weekend with Saturday high temperatures still as much as 15 to 20 degrees above average for portions of the inland valleys and lower coastal slopes of the mountains. High temperatures on Saturday will range from around 70 near the coast to around 80 for the Inland Empire with the lower to mid 80s for the lower deserts. && .LONG TERM (Sunday through Wednesday)... Not much change in high temperatures for Sunday. High temperatures may warm slightly on Monday with weak offshore lower- level flow, then cool slightly for Tuesday and Wednesday. Night and morning low clouds and fog will become patchier and not extend as far inland into coastal areas for the early and middle part of next week. && .AVIATION... 111030Z...Mostly clear with unrestricted vis today and tonight. Chances of cigs 500 feet or less and vis 1SM or less increases to around 30-50% after 05Z tonight into Friday near the coast. && .MARINE... There is a 30-50% chance of fog reducing visibility below 1 nautical mile tonight into Friday morning. Otherwise, no hazardous marine conditions are anticipated today through Monday. && .SKYWARN... Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ PUBLIC...17 AVIATION/MARINE...MM