Casa de Oro, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

923
FXUS66 KSGX 100343
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
843 PM PDT Wed Jul 9 2025

.SYNOPSIS...
Heat peaks today and Thursday for inland locations. Conditions will
return to slightly below average west of the mountains for the
weekend into next week, with above average temperatures remaining in
the deserts. A shallow marine layer with patchy low clouds and fog
near the coast Thursday morning, with a more uniform marine layer
cloud deck that will reach into the western valleys returning for
the weekend into early next week.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

This evening...Temperatures were well above seasonal averages
inland this afternoon while the coastal areas were near or a few
degrees above average. A couple of locations in the lower deserts
broke daily records as temperatures there reached 120 degrees at a
couple of locations. Mostly variable mid and high clouds with
only a few low clouds forming offshore at this hour. Patchy low
cloud coverage is expected tonight in the coastal areas due to a
very shallow marine layer.

From previous discussion...
An upper level high pressure system will continue to expand west
into Thursday, becoming more centered over Southern California.

With the upper level high expanding west across Southern California
through Thursday, above average temperatures are expected to
continue for inland locations. Highs through Thursday are
expected to be 5 to 10 degrees above average for inland locations.
High temperatures will range from the 70s near the coast; to the
90s to 105 for the Inland Empire; and 114 to 118 for the lower
deserts. In the mountains below 5000 ft, highs are expected to be
in the mid-80 to upper 90s. Widespread moderate HeatRisk is
expected for the valleys and mountains, with widespread major
HeatRisk in the low deserts. Make sure you`re staying hydrated,
seeking shade, and avoiding strenuous activity during the hottest
parts of the day if possible.

High pressure aloft will remain over Southern California Friday into
early next week, but will weaken slightly and continue to move
westward over the Pacific. Highs on Friday are expected to be 4 to 8
degrees cooler than Thursday across the area. For the weekend into
the middle of next week, there will be minor day to day fluctuations
in highs temperatures. NBM high temperatures for the coast and
valleys are forecast to be up to 5 degrees below average with the
deserts around 5 degrees above average. The marine layer will deepen
Sunday through Tuesday with night and morning low clouds extending
inland to the western valleys through the middle of next week.

&&

.AVIATION...
100315Z....Coast...FEW-SCT high clouds AOA 20 kft. Low clouds based
800-1200 ft MSL return to coastal waters tonight with areas of BKN
cigs over coastal SD County after 10Z. 60-70% chance at KSAN and 40-
50% chance at KCRQ for BKN or greater cigs by 12Z tonight.
Scattering to the coast again by 16Z. More extensive low clouds move
into coastal areas again after 06Z Fri, based 1000-1500 ft MSL.

Valleys/Mountains/Deserts...VFR conditions and unrestricted vis with
FEW-SCT thin high clouds AOA 20 kft through Thu.

&&

.MARINE...
Northwest wind gusts around 20 kts near San Clemente Island leading
to choppy seas this evening, diminishing after 06z. Otherwise, no
hazardous marine weather is expected through Sunday.

&&

.SKYWARN...
Skywarn activation is not requested. However weather spotters are
encouraged to report significant weather conditions.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Heat Advisory until 8 PM PDT Thursday for Riverside County
     Mountains-San Bernardino and Riverside County Valleys-The
     Inland Empire-San Diego County Mountains-San Diego County
     Valleys.

     Extreme Heat Warning until 8 PM PDT Thursday for Coachella
     Valley-San Diego County Deserts-San Gorgonio Pass near
     Banning.

PZ...None.

&&

$$

PUBLIC...PG
AVIATION/MARINE...CSP