872
FXUS66 KSGX 231827
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
1127 AM PDT Sat May 23 2026

.SYNOPSIS...
Near average temperatures through the weekend with below average
temperatures expected next week. Low clouds will spread into the
valleys each night and morning, lingering into the afternoon at
times along the coast. Increased westerly winds expected Tuesday
through potentially Thursday for the mountains and deserts. Patchy
drizzle or light rain possible west of the mountains overnight
Tuesday into Wednesday morning.

&&

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

High temperatures today are forecast to be within 5 degrees of
normal. Low clouds had filled in the coastal basin overnight and are
clearing to the coast as of 11 AM. While some coastal areas may
clear completely, others will only see partial and intermittent
clearing. A weak area of low pressure will approach Southern
California Sunday which will increase onshore flow, resulting in
widespread low cloud coverage with an increased chance of limited
clearing along the coast Sunday afternoon. The low will slowly
move east Monday afternoon, which will maintain a deeper marine
layer and cloudier skies into the afternoon. Additionally, highs
on Monday are expected to fall below average for areas west of the
mountains and to within 3 degrees of average for the deserts.

A more robust area of low pressure is expected to dig south into the
Pacific Northwest Tuesday. This will maintain cloudier and cooler
weather with widespread below average temperatures. Additionally,
winds are expected to increase over the mountains and into the
deserts. Strongest winds are expected on Tuesday afternoon into
Wednesday morning, with wind gusts 35 to 45 mph, local gusts to
60 mph in wind prone locations. Winds will weaken slightly into
Wednesday but remain elevated into Thursday morning. Areas of
patchy drizzle or light rain are possible Tuesday night into
Wednesday west of the mountains. Ensemble members of both the
ECMWF and GEFS show light precipitation, with more members of the
ECMWF on board compared to the GEFS. Regardless, any rainfall that
accumulates is expected to be less than 0.10".

Most ensemble guidance keeps the low over the Great Basin through
Thursday, which would maintain below average conditions but allow
for a few degrees of warming. By Friday, the low is expected to be
weaker and slightly further east which would bring an additional few
degrees of warming. The marine layer will likely become shallower
for the end of next week.

&&

.AVIATION...
231800Z...Coast/Valleys...Low clouds around 2500ft MSL are quickly
clearing from inland areas and retreating to the coast. A few low
clouds will linger over coastal areas throughout the day, pushing
back in after 00-01Z Sunday. Bases will be similar as they were this
morning with OVC/BKN clouds 1500-2500ft MSL, filling into the
inland valleys after 03-05Z and into the Inland Empire after 05-07Z.
Locally reduced VIS 3-5SM in far inland valleys, and 0-3SM where
clouds intersect higher terrain. Inland valleys will begin to see
scattering out after 16Z Sunday, with coastal locations scattering
after 17-18Z Sunday.

Otherwise, mostly clear and VFR conditions through the period.

&&

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

&&

.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...CO
AVIATION/MARINE...Villafane