Fallbrook, California 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

739
FXUS66 KSGX 161714
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
914 AM PST Tue Dec 16 2025

.SYNOPSIS...
High pressure aloft and weak offshore flow will bring warming of a
few degrees today with northeast winds gusting to 40 mph near and
below the Cajon Pass through this morning. For coastal areas,
night and morning coastal low clouds and locally dense fog will
continue through Wednesday. Onshore flow will spread cooling of a
few degrees inland on Wednesday followed by warming with weak
offshore flow on Thursday. Onshore flow and weakening high
pressure aloft will spread cooling inland for Friday through
Monday of next week, but with high temperatures remaining as much
as 10 to 15 degrees above average for some inland areas for
Saturday through Monday.

&&

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

Update: Fog is continuing to mix out and clear out from portions of
the inland areas from within about 5 miles east at this hour. These
clouds should completely clear to the coast within the next two
hours or so. Highs today are still looking to be quite warm,
especially for the inland valleys, where there could be some values
approaching the mid 80s within the IE. The forecast still remains on
track, with even warmer temperatures, and some locations being
around 20 degrees above normal for this time of year. It does look
like some relief from this warmth will come this weekend into next
week as we begin to see a cooling pattern taking place, and leading
to more active weather pattern with a return in the chance of rain
towards the end of next week.

Previous discussion submitted at 314 AM:

.SHORT TERM (Today through Thursday)...
Satellite imagery and surface reports show widespread low clouds
and locally dense fog extending inland in San Diego County to the
mesas and far western valleys and in Orange County inland past
Interstate 5. A Dense Fog Advisory continues for coastal areas
until 9 AM this morning. There is also weak offshore flow for
inland areas with the stronger gusts near and below the Cajon Pass
to 40 mph. High pressure aloft and weak offshore lower-level flow
will warm high temperatures today a few degrees from those on
Monday.

Weak onshore flow for Wednesday will cool high temperatures a few
degrees. Stronger high pressure aloft and weak offshore flow for
Thursday will bring warming of high temperatures of around 5
degrees for the coast and valleys with not much change for the
mountains and deserts. High temperatures on Thursday be as much as
20 degrees above average for portions of the inland valleys onto
the lower coastal slopes of the mountains. High temperatures on
Thursday will range from the lower 70s near the coast to the upper
70s to mid 80s for the valleys with the lower to mid 80s for the
lower deserts. For the coast and valleys, Thursday is expected to
be the warmest day of this week.

Through Friday, there will continue to be chances for both daytime
high temperature records to be tied of broken, mainly for the
mountains, far inland valleys, and lower deserts with a few record
warm overnight low temperatures as well.

&&

.LONG TERM (Friday through Monday)...
Weak onshore flow and weakening high pressure aloft will spread
cooling inland for Friday through the weekend. High temperatures
on Friday will be as much as 18 to 22 degrees above average for
the high desert and lower elevations of the mountains, then cool
to 12 to 18 degrees above average for the weekend. High
temperatures for the weekend will range from the mid to upper 60s
near the coast to the 70s for the valleys with the lower deserts
in the upper 70s to mid 80s.

On Monday, high pressure aloft may strengthen slightly across
southern California as a low pressure system develops farther off
the California coast. For Monday, the warmer solutions for
southern California area those with stronger high pressure aloft
over the western states with low pressure over the eastern Pacific
slower to move toward the coast.

&&

.AVIATION...
161615Z...Coast...Low clouds/FG based 200-400 ft MSL with tops to
600-700 ft and vis 1/4-2 SM fluctuating in and out of San Diego
coastal areas and firmly entrenched in northern Orange County.
Scatter out vcnty KSAN by 17Z, 18-19Z vcnty KSNA. Low clouds and fog
to return to coastal airports 01-05Z, with slightly higher cigs/vis
and extending a little farther inland overnight into Wednesday.

Otherwise...Mostly clear skies with unrestricted vis today and
tonight.

&&

.MARINE...
Areas of dense fog will continue this morning. A Marine Weather
Statement contains the details. Otherwise, no additional hazardous
marine conditions are expected through Saturday.

&&

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


&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...None.
PZ...None.

&&

$$

UPDATE...Stewey
PUBLIC...17
AVIATION/MARINE...CSP