Area Forecast Discussion
Issued by NWS San Diego, CA
Issued by NWS San Diego, CA
193 FXUS66 KSGX 161555 AFDSGX Area Forecast Discussion National Weather Service San Diego CA 855 AM PDT Thu Oct 16 2025 .SYNOPSIS... Drier and warmer weather the next several days with weak offshore flow and an upper level ridge in place, and temperatures rise to near or slightly above normal. Slightly cooler for early next week as the ridge breaks down with a low pressure system hanging just offshore. The low will bring further cooling for the end of the next week and a chance of showers. && .DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... .UPDATE... No significant changes to the forecast. Skies remain clear with an absent marine layer today. Given high pressure over the region, the marine layer will struggle to build back each night into the weekend. Cooler temperatures return early next week as a low pressure system moves closer to the coastline, and a more substantial marine layer may return as soon as Sunday. .PREVIOUS DISCUSSION FROM 348 AM PDT... .SHORT TERM (Today through Saturday)... For Friday and Saturday, high pressure from the eastern Pacific will spread across California with a developing low pressure system well to the southwest of the area becoming cut off. There will be a warming trend into the weekend. There will be weak offshore lower level flow as well with northerly winds gusts near the coastal slopes of the mountains mostly 35 mph or less. High temperatures for today will be as much as 10 to 15 degrees warmer than Wednesday for the inland valleys onto the coastal slopes of the mountains. There will be a few more degrees of warming on Friday and another few degrees of warming on Saturday. With the warming, high temperatures on Saturday for the coast and valleys will be a few to around 5 degrees above average with the deserts into the mountains a few to around 5 degrees below average. High temperatures on Saturday will range from the lower to mid 70s near the coast to the lower to mid 80s for the Inland Empire with the mid to upper 80s for the lower deserts. .LONG TERM (Sunday through Wednesday)... On Sunday, the mountains and deserts will continue to warm a few more degrees with slight cooling for the coast and valleys. That low pressure system well to the southwest of the area may move inland through southern California around Wednesday of next week. Monday and Tuesday may be a few degrees cooler with another 5 degrees or so of cooling. && .AVIATION... 161530Z....Clear and VFR conditions through Friday morning. && .MARINE... No hazardous marine conditions are expected through Monday. && .SGX WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ PUBLIC...Zuber AVIATION/MARINE...KW