030
FXUS66 KSGX 290945
AFDSGX

Area Forecast Discussion
National Weather Service San Diego CA
245 AM PDT Fri May 29 2026

.SYNOPSIS...
A deep marine layer will decrease in depth through the weekend
into next week. There will be scattered light showers at times
into this morning from the coast to the mountains, then dry
weather will prevail through next week. High temperatures will
warm more rapidly through the weekend, then more slowly for the
mountains and deserts for Monday through Thursday of next week
with not much change for the coast and valleys. High temperatures
for next week will be a few degrees above average for coastal
areas and around 4 to 8 degrees above average for inland areas.
Night and morning coastal low clouds for the weekend into next
week will spread into the western valleys late each night.

&&

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

.SHORT TERM (Today through Sunday)...
The marine layer is around 5000 feet deep, a decrease of around
500 feet from 24 hours ago. There have been a few light showers
since Thursday evening from the coastal waters to the coastal
slopes of the mountains with some increase in coverage expected
before sunrise into early this morning. Rainfall is expected to
once again be light for those locations receiving measurable
rainfall, a few hundredths of an inch to less than one-tenth inch.
The showers are expected to end by noon followed by dry weather
through next week.

High temperatures will begin to warm with the greater warming
continuing through the weekend. High temperatures for today will
be as much as 12 to 18 degrees below average for the mountains
with Sunday high temperatures for most areas a few to around 5
degrees above average. High temperatures for today will range from
the 60s near the coast to the upper 60s to mid 70s for the Inland
Empire with the lower to mid 80s for the lower deserts. On Sunday,
high temperatures will range from the lower 70s near the coast to
the mid 80s to lower 90s for the Inland Empire with the lower
deserts around 100.

The marine layer will decrease depth with night and morning
coastal low clouds spreading into the western valleys late each
night during the weekend.

&&

.LONG TERM (Monday through Thursday)...
After the more rapid warming through the weekend, high
temperatures for the deserts will warm much more slowly for
Monday through Thursday with slowly increasing spread in the high
temperature guidance for the middle of next week. The coast and
valleys may cool slightly on Tuesday followed by slow warming for
Wednesday and Thursday with increasing spread in the high
temperature guidance.

High temperatures will generally be a few degrees above average
for coastal areas to 4 to 8 degrees above average for inland areas
with high temperatures ranging from the lower 70s near the coast
to the 80s for the Inland Empire with 102 to 106 for the lower
deserts. Night and morning coastal low clouds will spread into the
western valleys late each night.

&&

.AVIATION...
291000Z...Coast/Valleys/Coastal Mountain Slopes...SCT-BKN low clouds
based 3000-5000 ft MSL will remain in place over the coastal basin
through late this morning. Vis reduced 0-5SM in FG on coastal
slopes. ISO-SCT -SHRA briefly reducing cigs to 2500 feet MSL through
18Z. Clouds will gradually clear from northwest to southeast 15-19Z
Friday. Patchy low clouds based near 2000 ft MSL develop over
coastal San Diego County around 01-03z Sat. Clouds increase in
coverage and expand to Orange County overnight, but remain confined
to coastal areas.

Higher Mountains/Deserts...VFR conditions expected through the
period. Westerly wind gusts 25-40 kts through mountain passes and
along desert slopes through 15Z Friday. Local up/downdrafts and
local LLWS in lee (east) of mountains. Elevated westerly winds
return late Friday afternoon with gusts 25-35 kts in the same
locations.

&&

.MARINE...
Northwest wind gusts will approach 20 kts over outer coastal waters
Saturday afternoon and evening. Otherwise, no hazardous marine
conditions are expected through Tuesday.

&&

.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...17
AVIATION/MARINE...KW

NWS San Diego (SGX) Office