Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
092 FXUS66 KSGX 111648 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 948 AM PDT Fri Jul 11 2025 .SYNOPSIS... High temperatures will cool a few degrees for today and Saturday, warm slightly on Sunday, then gradually cool through the middle of next week with high temperatures next Wednesday around average for the deserts and as much as 5 to 10 degrees below average for the valleys. Night and morning coastal low clouds will spread into the western valleys late each night. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Morning update... This morning`s coastal eddy allowed for appreciable inland intrusion of the marine layer, which filled in about 15 miles inland. The marine layer clouds have been pretty slow to clear, but have been efficiently scattering over the last hour. Beaches may keep the cloud cover into the afternoon hours with some spots not clearing at all today. Otherwise, the main highlight today is that we are on the back-end of the heat wave, with many locations about 5 to 10 degrees cooler than yesterday, while the deserts stay hot. From previous discussion... .SHORT TERM... High temperatures will cool a few degrees for today and Saturday with high temperatures on Saturday a few to around 5 degrees below average for the coast and valleys and around 5 degrees above average for the deserts. High temperatures on Saturday will range from the lower 70s near the coast to the mid 80s to mid 90s for the Inland Empire with 108 to 112 for the lower deserts. High temperatures on Sunday will be slightly warmer. There is a weak coastal eddy early this morning. Satellite imagery shows widespread low clouds over the coastal waters extending inland across all of the Orange County coastal plain and inland in San Diego County across about the western two-thirds of the valleys. The marine layer will deepen to around 2000 feet this morning with low clouds spreading into far western and far southern portions of the Inland Empire. Slow deepening of the marine layer will continue into Saturday morning with greater coverage of low clouds for the Inland Empire early Saturday. The marine will decrease in depth slightly for Saturday night and Sunday with coastal low clouds spreading into the western valleys with less coverage for the Inland Empire. && .LONG TERM... Days will be gradually cooler for Monday through Wednesday with Wednesday high temperatures around average for the deserts and as much as 5 to 10 degrees below average for the valleys. High temperatures for next Wednesday will range from around 70 near the coast to the 80s and lower 90s for the Inland Empire with 105 to 110 for the lower deserts. The marine layer will be around 2000 feet deep with night and morning coastal low clouds spreading into the western valleys late each night. && .AVIATION... 111600Z....Coast/Valleys...Low clouds 900-1300 ft MSL are continuing to clear toward the coast this morning. 40-50% chance BKN cigs linger this afternoon at KSAN and the immediate coastline. Clouds with similar bases move inland again after 02Z Sat and progressively build up to 15 miles inland with high terrain obscured in clouds/fog. Mountains/Deserts...VFR conditions and unrestricted VIS through Saturday. && .MARINE... No hazardous marine conditions expected through the middle of next week. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ PUBLIC...Munyan AVIATION/MARINE...APR