324
FXUS66 KSGX 120936
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
236 AM PDT Fri Jun 12 2026

.SYNOPSIS...
High temperatures for the next week will generally range from a
few degrees above average near the coast to 5 to 10 degrees above
average for the mountains and deserts with some slight day to day
differences. Moderate HeatRisk will continue for the deserts
through next Wednesday. Marine layer low clouds will spread into
portions of the western valleys during the nights and early
mornings, with day-to-day variations. There is a slight chance of
showers near the mountains for this afternoon.

&&

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

...Aviation discussion updated...

.SHORT TERM (Today through Sunday)...
The marine layer is around 1500 to 2000 feet deep with the late
Thursday afternoon NKX sounding showing moist layers in the mid
levels between 500 and 700 mb and at higher levels between 200
and 300 mb.

A weak upper level low pressure system continues to move slowly
westward and away from the coast of northern and central Baja.
Satellite imagery shows high level clouds and some mid level
clouds extend northeastward from this upper low and across
portions of southern California. The mid clouds are mostly across
San Diego County and northern Baja.

Satellite imagery also shows widespread low clouds covering most
of the southern California bight. However, with the mid and high
level moisture, there has been disruption to the low clouds along
the coast of Orange and San Diego Counties. The low clouds should
eventually return to some coastal areas and possibly portions of
the western valleys by around sunrise this morning.

With the mid level moisture and clouds, there remains the
possibility of virga or a few showers with limited rainfall for
this afternoon for the mountains and deserts. NBM thunder
probabilities for this afternoon are 5 to less than 10 percent
across San Diego and Riverside Counties and the San Bernardino
Mountains and adjacent deserts.

High temperatures for the coast and valleys will cool a few
degrees for the weekend while the deserts warm a few degrees.
High temperatures for today will be 5 to locally 10 degrees above
average with Sunday high temperatures ranging from a few degrees
above average for the coast and valleys to 4 to 8 degrees above
average for the deserts. Moderate HeatRisk will continue for the
deserts through the weekend into the middle of next week.

Several records for warmest daily minimum temperatures are likely
to be tied or broken each day for today through Sunday, mainly
for the coast and mountains, though there could also be a few for
the deserts and inland valleys.

&&

.LONG TERM (Monday through Thursday)...
There will be slight warming of high temperatures through
Tuesday, then cooling of a few degrees per day for Wednesday and
Thursday. High temperatures on Tuesday will range from near to a
few degrees above average near the coast to 5 to 10 degrees above
average for the mountains and deserts. With the cooling on
Wednesday and Thursday, High temperatures on Thursday will still
be a few degrees above average for the deserts, while cooling to
around 5 degrees below average for the valleys.

High temperatures on Tuesday will range from the lower to mid 70s
near the coast to the mid 80s to mid 90s for the Inland Empire
with 109 to 113 for the lower deserts. High temperatures on
Thursday will range from the lower to mid 70s near the coast to
the 80s for the Inland Empire with 104 to 108 for the lower
deserts. Moderate HeatRisk will continue for the deserts through
Wednesday.

&&

.AVIATION...
121000Z...Coast/Western Valleys...Areas of low clouds present along
the coast and locally inland into western valleys this morning.
Bases 800-1200 feet MSL with vis reductions 2-5 SM on higher coastal
and western valley terrain. Scatter out 16-18Z. Low clouds with
similar bases/vis along the coast will push ashore after 04Z
Saturday, though more upper/mid level clouds will likely lead to
initial patchiness.

Mountains/Deserts...Variable high clouds above 20000 feet MSL will
gradually thicken and lower today to about 12000-15000 feet MSL.
Cumulus at around 9000 feet MSL over mountains 15-23Z today could
produce very isolated -SHRA. Rising and thinning clouds after 00Z
Saturday.

&&

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

&&

.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...CSP

NWS San Diego (SGX) Office