971
FXUS66 KSGX 091158
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
458 AM PDT Mon Mar 9 2026

.SYNOPSIS...
A low pressure system moving into Baja will bring a slight chance
of showers to southern San Diego County early this morning and
again for this afternoon. Onshore flow will return today with high
temperatures cooler than Sunday, as much as 20 to 25 degrees
cooler near the coast. Inland areas will begin to warm on Tuesday
with much greater warming for the valleys on Wednesday and coastal
areas on Thursday with weak to locally moderate strength offshore
flow. The coast and valleys will cool for Saturday into Sunday,
but with high temperatures mostly remaining 15 to 20 degrees above
average. For next week, strong high pressure aloft and occasional
weak offshore lower flow will bring widespread record heat to
inland areas.

&&

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

.SHORT TERM (Today through Wednesday)...
A low pressure system off the coast of central Baja will move
slowly eastward and inland across central Baja tonight, then
accelerate eastward on Tuesday. A band of showers and isolated
thunderstorms across northern Baja early this morning will mostly
remain just south of the Mexican border this morning. A second
band of showers for this afternoon could be far enough north to
impact portions of San Diego County with chances for measurable
precipitation greatest across southern San Diego County at 15 to
25 percent.

High temperatures today will be cooler, as much as 20 to 25
degrees cooler near the coast. The deserts will begin to warm on
Tuesday. Much greater warming is expected on Wednesday, with high
temperatures for the inland valleys and lower elevations of the
mountains as much as 10 to 15 degrees warmer than Tuesday. High
temperatures on Wednesday will range from around 70 near the
coast to the 80s for the Inland Empire with the lower deserts in
the mid 80s to lower 90s.

&&

.LONG TERM (Thursday through Sunday)...
Strengthening high pressure aloft off the southern California
coast and offshore flow will bring additional warming on Thursday
with high temperatures for coastal areas as much as 10 to 15
degrees warmer than Wednesday. On Thursday, high temperatures for
much of the coast and valleys except near the coast will be 20 to
25 degrees above average. High temperatures on Thursday will
range from the lower to mid 80s near the coast to the upper 80s to
mid 90s for the valleys and inland Orange County with the lower
deserts in the mid to upper 90s. High temperatures will continue
to warm another few degrees for inland areas on Friday with high
temperatures for the Coachella close to all-time record highs for
March each day for Friday through Sunday.

A brief return of onshore flow for the weekend could bring some
cooling for the coast into the valleys, but with Sunday high
temperatures still around 10 degrees above average near the coast
to 20 to 25 degrees above average for the inland valleys with the
deserts around 20 degrees above average. High temperatures on
Sunday would range from the mid to upper 70s near the coast to the
lower to mid 90s for the inland valleys with the lower deserts
around 100.

Even hotter weather is likely for inland areas next week, with
new all-time record high temperatures for March likely to be
set for Palm Springs and Thermal. For Tuesday through Thursday of
next week for Thermal, NBM has a 50 percent chance or greater
each day to reach or exceed 110. If that were to happen, that
would be the earliest date for Thermal to reach 110 by about two
months. For Palm Springs, the NBM chance to reach or exceed 110 is
25 percent on both Wednesday and Thursday of next week.

&&

.AVIATION...
091145Z...VFR conditions expected through the TAF period with
increasing high clouds AOA 10,000ft MSL through the afternoon. VCSH
at KSAN and -SHRA for the San Diego County mountains and coastal
foothills now through 06z Tue. The chance for any showers to impact
KSAN is less than 10%, but may briefly bring MVFR CIGs/VIS should
one pass overhead. High clouds will begin to clear out this evening,
with patchy low clouds developing generally after 08z Tue. MVFR CIGs
possible at all coastal sites as early as 10z with bases generally
2000-2500ft MSL.

&&

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

&&

.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...Zuber