Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
676 FXUS66 KSGX 102048 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 1248 PM PST Wed Dec 10 2025 .SYNOPSIS... Strong high pressure over the region will contribute to warm days with dry weather for the foreseeable future. High pressure will weaken some by the weekend, allowing for slight cooling trend with areas of low clouds and fog each morning by later this week. The area of high pressure will drift southward by early next week, continuing the warmer and drier weather pattern. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... High pressure centered off the Central Coast continues to bring light offshore winds and sunny skies to the region today. The heat will peak for inland areas this afternoon with highs reaching into the mid 80s. Highs look to reach near 80 degrees across the lower deserts as well as within a few miles of the coastline. Some places may break record daily highs today, including Chula Vista, Riverside, Ramona, Palomar Mtn, and Borrego Springs. Confidence in breaking a record later today is at Ramona, where the forecast high temperature is 85 and the record for the day stands at 81, set in 2004. There is low confidence in the cloud and fog forecast for the next couple of mornings as the marine layer remains thin. Models suggest patchy fog may form tonight, but confidence remains low on this. As the high slowly weakens overhead, the marine layer will have a better chance to rebuild slowly over the coming days. The best chance for any impactful fog would be by Friday morning. The marine layer will deepen more significantly by the weekend as the high weakens further, with low clouds expected into the western valleys. Weak offshore flow will continue each afternoon as the high slowly weakens into the weekend, which will bring a subtle cooling trend to our region. Most area west of the mountains in the 80s today will dip into the 70s by the weekend. The area of high pressure will begin to drift southward but assert dominance over the area, bringing a similar weather pattern with warm and dry weather. Ensemble models show this ridging pattern holding on for the foreseeable future, which would continue the dry weather pattern into much of next week. && .AVIATION... 102100Z...Clear skies and VFR conditions continue through the TAF period. Winds will peak around 25-30 kts over the next couple hours in the foothills and locally adjacent valleys before beginning to slowly trend downward through Thursday morning. Patchy fog will be possible along the immediate coast after 05Z Thursday but confidence isn`t high enough that conditions will fall below VFR to include in the TAFs at this time. && .MARINE...Patchy, intermittent fog development possible after midnight tonight which may reduce local visibility below 1 NM at times through Friday morning. Otherwise, no hazardous marine conditions are anticipated through Sunday. && .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...APR AVIATION/MARINE...Villafane