Chula Vista, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

708
FXUS66 KSGX 052144
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
144 PM PST Fri Dec 5 2025

.SYNOPSIS...
Weaker winds will occur across the region for the weekend with
tranquil weather expected. Patchy dense fog may occur near the
coast by Sunday and Monday mornings. High pressure will
strengthen over the area into next week, bringing warmer
temperatures and increasing winds. Santa Ana winds will strenghten
across the region by Monday and Tuesday with weak to locally
moderate strength expected. The area of high pressure looks to
stick around into the end of the week, keeping our weather pattern
warm and dry as we move into the middle of the month.

&&

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

Offshore flow continues to weaken over the region this afternoon
with wind gusts in the foothills/passes seeing gusts near 15-25
MPH. The pressure gradient will relax and turn subtly onshore by
Saturday, leading to similar temperatures to those of today. This
slow onshore push will deepen the marine layer slightly, leading
to a better chance of fog near the coast by Saturday night into
Sunday morning. Some of the fog may be dense (near 1/4 - 1/2 mile
visibility at times), which may impact airport travel. An area of
high pressure currently off the coast, will begin to expand over
our region by Sunday into early next week. Due to this, Sunday
will be the beginning of a warming trend across Southern
California. The greatest warming will be felt of the lower deserts
and valleys west of the mountains with highs reaching into the
upper 70s.

The high expands further eastward over the area by Monday. Models
seem to have less of a handle on any fog development on this day,
but the chance still remains whether the marine layer will be deep
enough for another day of dense fog. Offshore flow will
strengthen on Monday into Tuesday. Confidence has increased
slightly from previous forecast, with a weak to locally moderate
event becoming increasingly likely. Winds were nudged up some
across the region during this time to reflect this increasing
confidence in widespread wind gusts near 25-35 MPH, locally near
45 MPH in the mountains. Wind speeds and overall direction will
become more clear in the coming days as we continue to forecast
the exact placement of the area of high pressure near the region.

NBM chances for high temperatures over 85 degrees increase near
20-50% by Tuesday through Friday of next week. There is higher
confidence that many valley west of the mountains and lower
deserts to see highs in the 80s, which would be 10-15 degrees
above normal. Weak offshore flow will prevail during this period
as well. The offshore pattern and the high`s position over the
area will give a more detailed temperature forecast in the coming
days. Low temperatures will also be above average, so not as
chilly out there as well. The area of high pressure looks to stick
around through much of the work week next week, with slight
diversions on its strength and location by next weekend. Whatever
the exact outcome, expect warm and dry weather as we go into the
middle of the month.

&&

.AVIATION...
052100Z....Mostly clear skies and VFR conditions are expected
through Sat afternoon.

&&

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

&&

.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...APR
AVIATION/MARINE...Westerink