889
FXUS66 KSGX 172011
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
111 PM PDT Fri Oct 17 2025

.SYNOPSIS...
Drier and warmer weather with weak offshore flow and high
pressure building in, allowing temperatures to rise to near normal
into the weekend. Slightly cooler for early next week as an upper
level low moves inland, decreasing heights. The low will bring
further cooling for the end of the next week and a low chance of
showers, with chances for measurable rainfall currently less than
10%.

&&

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

It`s a lovely fall day in Southern California - sunny skies with
near normal temperatures prevailing into the weekend. An upper level
low will settle just off the coast today, pinching off from the main
trough as it passes through the Four Corners. Weak offshore flow and
increasing heights today has helped us warm significantly from
Thursday, with highs in the 70s and 80s for most locations. Winds
switch more onshore for coastal areas Saturday and Sunday, and temps
will continue to warm through the weekend, returning to near normal
for mid-October. The stationary low will begin to slide eastward on
Monday, only cooling temperatures a degree or two over Sunday`s
peak. As the low moves into California Tuesday and into Wednesday,
meager moisture associated with the low may be just enough for a few
rain showers in the higher terrain where orographic lift may assist,
but otherwise, this system looks to be fairly dry. As the low moves
across, substantial cooling will be observed, especially for
Wednesday, when highs may only reach the 60s for coastal and
valley areas. Timing of the arrival of the low will influence
temperatures drastically for the middle of next week, along with a
deepening marine layer and how far inland it is able to spread.
Either way, highs for mid-week could be anywhere from 3-10 degrees
below normal.

As the system moves up and out of the region Thursday, more zonal
flow settles in with very slow warming. A few models indicate that
there may be a shortwave trough move across late next week, but the
real eye-catcher in the long range is a massive low moving down into
the PacNW, helping usher in substantial moisture to California as
early as next weekend. Don`t get too excited yet, as chances for
meaningful rainfall in SoCal remains low this far out, but this will
be something to keep a close eye on.


&&

.AVIATION...
172000Z....Clear and VFR conditions through early Saturday.

&&

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

&&

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

&&

$$

PUBLIC...Zuber
AVIATION/MARINE...Small