La Mesa, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

437
FXUS66 KSGX 131857
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1057 AM PST Tue Jan 13 2026

.SYNOPSIS...
Periods of gusty Santa Ana winds will continue into Thursday with
warmer high temperatures through Wednesday. For Thursday through
Saturday, there will be slight day to day differences in high
temperatures followed by a cooling trend for Sunday into the
middle of next week. Night and morning coastal low clouds and fog
could return as soon as late Thursday night.

&&

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

Tonight through tomorrow night...

Strong and gusty winds due to moderate Santa Ana conditions will
continue, especially by later this afternoon for some of the
lower elevations as well once winds have mixed down to the
surface. The strongest gusts will likely be felt in vicinity of
Cajon Pass and also across the Tecate Divide in San Diego County
(east of Pine Valley to Jacumba), where there could be winds
occasionally gusting 50 to 55 mph at times. These winds will begin
to decouple and diminish by later this evening and overnight. The
clear skies will allow for some of the wind-sheltered valleys to
get quite cold, and even a few areas could potentially see frost
within some of the higher inland valleys. Winds will begin to
increase again tomorrow during the day, although likely not be as
strong as they will be today. Where there will still be winds,
temperatures will be relatively warmer. The offshore winds will
keep the skies mostly clear through at least tomorrow.
Temperatures will also continue to warm, with highs begin warmer
today from where they were yesterday, and the warmest day being
tomorrow with highs running around 10 to 15 degrees above the
seasonal average for this time of year, with mid 80s for the
inland areas.

Thursday through Monday...

Mild to moderate Santa Ana conditions continue to impact the
region with a slight uptick in wind strength on Thursday,
although these will continue to diminish gradually by Friday and
into the weekend as the pressure gradient weakens with the ridge
expanding northwestward. As this occurs, the ridge axis will
become more elongated and negatively tilted, which will act as a
blocking pattern and keep the dry conditions persisting through
the beginning of next week, with only a gradual cooldown as some
troughing to the east over central CONUS does help to influence
the region with cooler air advection from the north, although with
the ridge still in control, along with weak downsloping winds,
temperatures will remain above average. The offshore winds will
predominantly keep any development of the marine layer mostly
confined over the coastal waters, although there could be a return
of some fog/low clouds moving in over portions of the coast and
inland areas of San Diego and Orange counties beginning Thursday
night into Friday morning. The development of the marine layer
will continue to become more prevalent going into the weekend and
into early. Looking beyond the forecast, ensembles are hinting at
the possibility of a return of precipitation towards the mid part
to end of next week.

&&

.AVIATION...131830Z...Mostly clear skies and VFR conditions today
and tonight. East to northeast winds 20-30 kts with isolated gusts
to 40 kts in foothills and adjacent valleys. Mod up/downdrafts in
lee of mountains. Localized LLWS Wed morning, but unlikely for any
TAF site.

&&

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

&&

.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...Stewey
AVIATION/MARINE...CSP