290
FXUS66 KSGX 051942
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1242 PM PDT Sat Jul 5 2025

.SYNOPSIS...
High temperatures near average with night and morning low clouds
closer to the coast can be expected through Monday. High pressure
over the Desert Southwest will build into the region for Tuesday
into later next week, bringing hotter weather for inland areas.

&&

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

An area of low pressure has formed near the Bay Area that is
helping to keep our temperatures near average for early July.
Sunny weather will continue through the evening with low clouds
making it back to coastal areas later tonight. Foggy conditions
will occur in coastal valleys and elevated terrain each morning
through Monday as the marine layer depth remains rather unchanged
as the area of low pressure remains off the coast. High temperatures
will not change too much either by Sunday and Monday with readings
near average.

Models continue to indicate the area of high pressure to our
south and east to strengthen over the Dessert Southwest. By
Tuesday, this will increase temperatures a few more degrees than
what we are currently experiencing this weekend. Ensemble models
show the area of high pressure peaking around 595-598 dm over the
region on Wednesday through at least Friday, prompting the first
notable heat wave of the summer. Low level monsoonal moisture will
begin to move into the region by Tuesday and Wednesday. There
continues to be a near zero chance of thunderstorm activity, with
some cumulus clouds possible over mountain peaks. This increasing
humidity will make the hot weather feel a bit more oppressive,
especially across the lower deserts. Humidity will decrease
slightly into the end of the week. For anyone living in valleys
west of the mountains and desert regions, please stay safe in the
heat if you are without any sufficient cooling measures or have to
work outside during this time into the end of next week. High
temperatures will be in the mid 80s to mid 90s across the
mountains as well, so any outdoor recreation should be limited to
early morning or evening hours to avoid the hottest part of the
day.

The warmest weather will take place by Wednesday and Thursday
with high temperatures increasing to 5 to 10 degrees above normal.
Chances for 100 degree or greater temperatures are high across
the IE and the high desert, with confidence increasing across
portions of the Inland Empire. This is closer to 40-70% for inland
valleys/foothills across San Diego County such as Ramona and Pine
Valley. Highs over 115 across the lower deserts still remains
somewhat in question as higher humidity can act to suppress the
the hot dry air that is typically associated with high pressure
systems of this magnitude. Confidence is increasing that only
subtle cooling will occur into later next week, keeping things
above average and warm.

&&

.AVIATION...
051900Z....Coast/Valleys...Clear skies will remain through the bulk
of the daylight hours, with marine layer stratus returning this
evening and overnight. Cloud bases 700-1200 feet MSL will have a
more limited movement ashore overnight in SD/Orange Counties, likely
after 06Z Sun. Slightly less inland extent than this morning. Vis
restrictions for elevated coastal terrain and western valleys.

Mountains/Deserts...Sunny with mostly unrestricted VIS through
Sunday.

&&

.MARINE...
No hazardous marine weather conditions are expected through
Wednesday.

&&

.BEACHES...
Southerly swell (190 degrees) of 3 to 4 feet at 15-17 seconds will
generate elevated surf of 4-6 ft with sets to 7 ft along south
facing beaches through Sunday. In addition, strong rip and longshore
currents are expected at all beaches through Sunday. A Beach Hazards
Statement is in effect and contains more information. Surf may
remain elevated into early next week.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Beach Hazards Statement through Sunday evening for Orange County
     Coastal Areas-San Diego County Coastal Areas.

PZ...None.

&&

$$

PUBLIC...APR
AVIATION/MARINE/BEACHES...Suk