889
FXUS66 KSGX 140824
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
124 AM PDT Mon Sep 14 2026

.SYNOPSIS...
Low pressure over the western states will bring a gradual cooling
trend through Wednesday with high temperatures cooling to as much
as 5 to 10 degrees below average for the Inland Empire. Night and
morning coastal low clouds will increase in coverage and spread
farther into the western valleys for early Tuesday and early
Wednesday as the marine layer slowly deepens. This will be
followed by a gradual warming trend for Thursday into next
weekend.

&&

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

.SHORT TERM (Today through Wednesday)...
Low pressure along the West Coast will continue a cooling trend
through Wednesday. High temperatures today will cool a few
degrees, cool another few to around 5 degrees on Tuesday, with a
few more degrees of cooling on Wednesday.

High temperatures on Wednesday will be near average at the San
Diego County coast, and elsewhere a few degrees below average to
as much as 5 to 10 degrees below average for the Inland Empire.
High temperatures on Wednesday will range from the 70s near the
coast to the lower do mid 80s for the Inland Empire with the
lower deserts near 100.

A weak coastal eddy will bring slow deepening of the marine layer
with night and morning coastal low clouds spreading into portions
of the western valleys for early Tuesday and early Wednesday.

&&

.LONG TERM (Thursday through Sunday)...
Low pressure over the western states will weaken with a warming
trend for southwestern California for Thursday into next weekend.
with high temperatures on Saturday a few degrees above average
for the deserts to a few degrees below average for the valleys.
High temperatures on Saturday will range from the 70s near the
coast to the mid 80s to lower 90s for the Inland Empire with 102
to 106 for the lower deserts. Not much change is expected for
Sunday.

&&

.AVIATION...
140600Z...Coasts/Valleys...SCT-FEW low clouds above 2000ft MSL
moving ashore and slowly increasing in coverage at this hour. Expect
coverage to increase, with widespread CIGs in the coastal areas by
09Z. Clouds spread about 20 miles inland by 14Z. Slightly less
inland extent expected across the Inland Empire compared to last
night, with only a 30-40% chance of CIGs VCNTY KONT between 12Z-16Z.
VIS reductions of 4-6 SM in elevated inland valleys in HZ/BR, and
down to 0-5 SM where clouds intersect terrain in the IE and
surrounding foothills. Clouds clear to the coast between 15-17Z.

Mountains/Deserts...Clear skies with unrestricted VIS through the
TAF period. Typical late afternoon S/W winds gusting 15-25 kts (up
to 35 kts through the Banning Pass) expected, weakening after 06Z.

&&

.MARINE...
No hazardous marine conditions are expected through Thursday.

&&

.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

NWS San Diego (SGX) Office